diff --git a/electron-projects/ucap-webmessenger-electron/src/index.ts b/electron-projects/ucap-webmessenger-electron/src/index.ts
index 3e6f4e12..c0edd838 100644
--- a/electron-projects/ucap-webmessenger-electron/src/index.ts
+++ b/electron-projects/ucap-webmessenger-electron/src/index.ts
@@ -241,8 +241,9 @@ ipcMain.on(
     try {
       const buffer: Buffer = args[0];
       const fileName: string = args[1];
+      const mimeType: string = args[2];
       let savePath: string = path.join(
-        !!args[2] ? args[2] : DefaultFolder.downloads(),
+        !!args[3] ? args[3] : DefaultFolder.downloads(),
         fileName
       );
       savePath = await FileUtil.uniqueFileName(savePath);
diff --git a/package-lock.json b/package-lock.json
index 1cf3217b..c7ce56cf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2789,6 +2789,15 @@
       "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
       "dev": true
     },
+    "angular-split": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/angular-split/-/angular-split-3.0.2.tgz",
+      "integrity": "sha512-km59k1kEgVlplo2t4t5Ob43Vx16qVXWXsl5gbsdQtqrOW7341So4CFUmCjcZgfk1swu9RBaCdSQEqzNWOe/89w==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.9.0"
+      }
+    },
     "ansi-align": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-3.0.0.tgz",
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/common/dialogs/file-viewer.dialog.component.html b/projects/ucap-webmessenger-app/src/app/layouts/common/dialogs/file-viewer.dialog.component.html
index ff5c6c5e..0092f806 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/common/dialogs/file-viewer.dialog.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/common/dialogs/file-viewer.dialog.component.html
@@ -1,11 +1,6 @@
-<mat-progress-bar
-  *ngIf="fileDownloadItem && fileDownloadItem.downloadingProgress$"
-  mode="determinate"
-  [value]="fileDownloadItem.downloadingProgress$ | async"
-></mat-progress-bar>
 <ucap-file-viewer
   [fileInfo]="fileInfo"
   [fileDownloadUrl]="fileDownloadUrl"
-  (download)="onDownload()"
+  (download)="onDownload($event)"
   (closed)="onClosedViewer()"
 ></ucap-file-viewer>
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/common/dialogs/file-viewer.dialog.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/common/dialogs/file-viewer.dialog.component.ts
index 82da29c2..4075c0aa 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/common/dialogs/file-viewer.dialog.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/common/dialogs/file-viewer.dialog.component.ts
@@ -3,7 +3,7 @@ import {
   OnInit,
   OnDestroy,
   Inject,
-  EventEmitter
+  EventEmitter,
 } from '@angular/core';
 
 import { MatDialogRef, MAT_DIALOG_DATA } from '@angular/material';
@@ -15,7 +15,7 @@ import { take, map, finalize, tap } from 'rxjs/operators';
 import { SnackBarService } from '@ucap-webmessenger/ui';
 import {
   FileDownloadItem,
-  CommonApiService
+  CommonApiService,
 } from '@ucap-webmessenger/api-common';
 
 export interface FileViewerDialogData {
@@ -31,7 +31,7 @@ export interface FileViewerDialogResult {}
 @Component({
   selector: 'app-layout-common-file-viewer',
   templateUrl: './file-viewer.dialog.component.html',
-  styleUrls: ['./file-viewer.dialog.component.scss']
+  styleUrls: ['./file-viewer.dialog.component.scss'],
 })
 export class FileViewerDialogComponent implements OnInit, OnDestroy {
   fileInfo: FileEventJson;
@@ -40,8 +40,6 @@ export class FileViewerDialogComponent implements OnInit, OnDestroy {
   deviceType: DeviceType;
   token: string;
 
-  fileDownloadItem: FileDownloadItem;
-
   fileDownloadUrl: string;
 
   constructor(
@@ -66,7 +64,7 @@ export class FileViewerDialogComponent implements OnInit, OnDestroy {
         userSeq: this.userSeq,
         deviceType: this.deviceType,
         token: this.token,
-        attachmentsSeq: this.fileInfo.attachmentSeq
+        attachmentsSeq: this.fileInfo.attachmentSeq,
       },
       this.downloadUrl
     );
@@ -76,8 +74,7 @@ export class FileViewerDialogComponent implements OnInit, OnDestroy {
 
   ngOnDestroy(): void {}
 
-  onDownload(): void {
-    this.fileDownloadItem = new FileDownloadItem();
+  onDownload(fileDownloadItem: FileDownloadItem): void {
     this.commonApiService
       .fileTalkDownload(
         {
@@ -85,37 +82,36 @@ export class FileViewerDialogComponent implements OnInit, OnDestroy {
           deviceType: this.deviceType,
           token: this.token,
           attachmentsSeq: this.fileInfo.attachmentSeq,
-          fileDownloadItem: this.fileDownloadItem
+          fileDownloadItem,
         },
         this.downloadUrl
       )
       .pipe(
         take(1),
         map(async rawBlob => {
-          const blob = rawBlob.slice(
-            0,
-            rawBlob.size,
-            MimeUtil.getMimeFromExtension(this.fileInfo.fileExt)
-          );
+          const mimeType = MimeUtil.getMimeFromExtension(this.fileInfo.fileExt);
+          const blob = rawBlob.slice(0, rawBlob.size, mimeType);
 
           FileUtil.fromBlobToBuffer(blob)
             .then(buffer => {
               this.nativeService
-                .saveFile(buffer, this.fileInfo.fileName)
-                .pipe(take(1))
-                .subscribe(result => {
+                .saveFile(buffer, this.fileInfo.fileName, mimeType)
+                .then(result => {
                   if (!!result) {
                     this.snackBarService.open(
                       `파일이 경로[${result}]에 저장되었습니다.`,
                       '',
                       {
                         duration: 3000,
-                        verticalPosition: 'bottom'
+                        verticalPosition: 'bottom',
                       }
                     );
                   } else {
                     this.snackBarService.open('파일 저장에 실패하였습니다.');
                   }
+                })
+                .catch(reason => {
+                  this.snackBarService.open('파일 저장에 실패하였습니다.');
                 });
             })
             .catch(reason => {
@@ -123,7 +119,9 @@ export class FileViewerDialogComponent implements OnInit, OnDestroy {
             });
         }),
         finalize(() => {
-          this.fileDownloadItem = undefined;
+          setTimeout(() => {
+            fileDownloadItem.downloadingProgress$ = undefined;
+          }, 1000);
         })
       )
       .subscribe();
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
index b6dfa404..8f23ba54 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
@@ -485,7 +485,6 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
   }
 
   async onFileViewer(fileInfo: FileEventJson) {
-    this.logger.debug('onFileViewer', fileInfo);
     const result = await this.dialogService.open<
       FileViewerDialogComponent,
       FileViewerDialogData,
diff --git a/projects/ucap-webmessenger-app/src/app/store/account/authentication/effects.ts b/projects/ucap-webmessenger-app/src/app/store/account/authentication/effects.ts
index d7a9eb0b..d33291f4 100644
--- a/projects/ucap-webmessenger-app/src/app/store/account/authentication/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/account/authentication/effects.ts
@@ -1,7 +1,7 @@
 import { Injectable, Inject } from '@angular/core';
 import { Router } from '@angular/router';
 
-import { of } from 'rxjs';
+import { of, Observable } from 'rxjs';
 import { catchError, exhaustMap, map, tap, switchMap } from 'rxjs/operators';
 
 import { Actions, ofType, createEffect } from '@ngrx/effects';
@@ -86,19 +86,28 @@ export class Effects {
     () =>
       this.actions$.pipe(
         ofType(webLoginSuccess),
-        switchMap(params =>
-          this.nativeService.checkForUpdates().pipe(
-            map((update: boolean) => {
-              if (!update) {
-                this.appAuthenticationService.login(
-                  params.loginInfo,
-                  params.rememberMe
-                );
-                this.router.navigate(['/messenger']);
-              }
-            }),
-            catchError(error => of(error))
-          )
+        switchMap(
+          params =>
+            new Observable<void>(subscriber => {
+              this.nativeService
+                .checkForUpdates()
+                .then((update: boolean) => {
+                  if (!update) {
+                    this.appAuthenticationService.login(
+                      params.loginInfo,
+                      params.rememberMe
+                    );
+                    this.router.navigate(['/messenger']);
+                  }
+                  subscriber.next();
+                })
+                .catch(reason => {
+                  subscriber.error(reason);
+                })
+                .finally(() => {
+                  subscriber.complete();
+                });
+            })
         )
       ),
     { dispatch: false }
diff --git a/projects/ucap-webmessenger-core/src/lib/utils/file.util.ts b/projects/ucap-webmessenger-core/src/lib/utils/file.util.ts
index 387f3cef..eb5e78b5 100644
--- a/projects/ucap-webmessenger-core/src/lib/utils/file.util.ts
+++ b/projects/ucap-webmessenger-core/src/lib/utils/file.util.ts
@@ -69,6 +69,113 @@ export class FileUtil {
     a.remove();
   }
 
+  static save(
+    buffer: Buffer,
+    fileName: string,
+    mimeType: string
+  ): Promise<string> {
+    return new Promise<string>((resolve, reject) => {
+      const defaultMime = 'application/octet-stream';
+      const mime = !!mimeType ? mimeType : defaultMime;
+      const blob = new Blob([buffer], { type: mime });
+
+      if (navigator.msSaveBlob) {
+        // IE10+ : (has Blob, but not a[download] or URL)
+        navigator.msSaveBlob(blob, fileName);
+        resolve(fileName);
+        return;
+      }
+
+      const download = (url: string, mode: boolean = false) => {
+        const anchor = document.createElement('a');
+
+        if ('download' in anchor) {
+          // html5 A[download]
+          anchor.href = url;
+          anchor.setAttribute('download', fileName);
+          anchor.className = 'download-js-link';
+          anchor.innerHTML = 'downloading...';
+          anchor.style.display = 'none';
+          document.body.appendChild(anchor);
+
+          setTimeout(() => {
+            anchor.click();
+            document.body.removeChild(anchor);
+            resolve(fileName);
+            if (mode) {
+              setTimeout(() => {
+                window.URL.revokeObjectURL(anchor.href);
+              }, 250);
+            }
+          }, 66);
+          return;
+        }
+
+        // handle non-a[download] safari as best we can:
+        if (
+          /(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(
+            navigator.userAgent
+          )
+        ) {
+          url = url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
+          if (!window.open(url)) {
+            // popup blocked, offer direct download:
+            if (
+              confirm(
+                'Displaying New Document\n\nUse Save As... to download, then click back to return to this page.'
+              )
+            ) {
+              location.href = url;
+            }
+          }
+          resolve(fileName);
+          return;
+        }
+
+        // do iframe dataURL download (old ch+FF):
+        const f = document.createElement('iframe');
+        document.body.appendChild(f);
+
+        if (!mode) {
+          // force a mime that will download:
+          url = 'data:' + url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
+        }
+        f.src = url;
+        setTimeout(() => {
+          document.body.removeChild(f);
+        }, 333);
+      };
+
+      if (window.URL) {
+        download(window.URL.createObjectURL(blob), true);
+      } else {
+        if (
+          typeof blob === 'string' ||
+          (blob as any).constructor === this.toString
+        ) {
+          try {
+            download(
+              'data:' + mime + ';base64,' + window.btoa((blob as any) as string)
+            );
+          } catch (e) {
+            download(
+              'data:' +
+                mime +
+                ';base64,' +
+                encodeURIComponent((blob as any) as string)
+            );
+          }
+        } else {
+          const fileReader = new FileReader();
+          fileReader.onload = () => {
+            download(fileReader.result as string);
+          };
+          fileReader.readAsDataURL(blob);
+        }
+      }
+    });
+  }
+
   static thumbnail(file: File): Promise<File> {
     return new Promise<File>((resolve, reject) => {
       const fileReader = new FileReader();
diff --git a/projects/ucap-webmessenger-native-browser/src/lib/services/browser-native.service.ts b/projects/ucap-webmessenger-native-browser/src/lib/services/browser-native.service.ts
index b33c5e7a..42a40760 100644
--- a/projects/ucap-webmessenger-native-browser/src/lib/services/browser-native.service.ts
+++ b/projects/ucap-webmessenger-native-browser/src/lib/services/browser-native.service.ts
@@ -12,6 +12,7 @@ import { TranslateLoader } from '@ngx-translate/core';
 import { TranslateLoaderService } from '../translate/browser-loader';
 import { NotificationService } from '../notification/notification.service';
 import { Injectable } from '@angular/core';
+import { FileUtil } from '@ucap-webmessenger/core';
 
 @Injectable({
   providedIn: 'root',
@@ -34,34 +35,35 @@ export class BrowserNativeService extends NativeService {
   }
   closeAllNotify(): void {}
 
-  checkForUpdates(): Observable<boolean> {
-    return new Observable<boolean>(subscriber => {
-      try {
-        subscriber.next(false);
-      } catch (error) {
-        subscriber.error(error);
-      } finally {
-        subscriber.complete();
-      }
+  checkForUpdates(): Promise<boolean> {
+    return new Promise<boolean>((resolve, reject) => {
+      resolve(false);
     });
   }
 
   showImageViewer(): void {}
 
-  readFile(path: string): Observable<Buffer> {
-    return this.httpClient.get(path, { responseType: 'arraybuffer' }).pipe(
-      map(arrayBuffer => {
-        return Buffer.from(arrayBuffer);
-      })
-    );
+  readFile(path: string): Promise<Buffer> {
+    return new Promise<Buffer>((resolve, reject) => {
+      resolve(null);
+    });
   }
 
   saveFile(
     buffer: Buffer,
     fileName: string,
+    mimeType: string,
     path?: string
-  ): Observable<string> {
-    return this.httpClient.post<string>(path, buffer, {});
+  ): Promise<string> {
+    return new Promise<string>((resolve, reject) => {
+      try {
+        FileUtil.save(buffer, fileName, mimeType).then(fn => {
+          resolve(fn);
+        });
+      } catch (error) {
+        reject(error);
+      }
+    });
   }
 
   windowStateChanged(): Observable<WindowState> {
@@ -85,7 +87,6 @@ export class BrowserNativeService extends NativeService {
   idleStateChanged(): Observable<WindowIdle> {
     return new Observable<WindowIdle>(subscriber => {
       try {
-        subscriber.next(WindowIdle.Active);
       } catch (error) {
         subscriber.error(error);
       } finally {
diff --git a/projects/ucap-webmessenger-native-browser/src/lib/translate/browser-loader.ts b/projects/ucap-webmessenger-native-browser/src/lib/translate/browser-loader.ts
index 0024d8a9..6ca66160 100644
--- a/projects/ucap-webmessenger-native-browser/src/lib/translate/browser-loader.ts
+++ b/projects/ucap-webmessenger-native-browser/src/lib/translate/browser-loader.ts
@@ -1,7 +1,6 @@
 import { TranslateLoader } from '@ngx-translate/core';
 import { Observable } from 'rxjs';
 import { NativeService } from '@ucap-webmessenger/native';
-import { take, map } from 'rxjs/operators';
 import { Injectable } from '@angular/core';
 
 @Injectable({
@@ -18,13 +17,18 @@ export class TranslateLoaderService implements TranslateLoader {
    * Gets the translations from the server
    */
   public getTranslation(lang: string): Observable<any> {
-    return this.nativeService
-      .readFile(`${this.prefix}${lang}.${this.suffix}`)
-      .pipe(
-        take(1),
-        map(buffer => {
-          return JSON.parse(buffer.toString('utf-8'));
+    return new Observable<any>(subscriber => {
+      this.nativeService
+        .readFile(`${this.prefix}${lang}.${this.suffix}`)
+        .then(buffer => {
+          subscriber.next(JSON.parse(buffer.toString('utf-8')));
         })
-      );
+        .catch(reason => {
+          subscriber.error(reason);
+        })
+        .finally(() => {
+          subscriber.complete();
+        });
+    });
   }
 }
diff --git a/projects/ucap-webmessenger-native-electron/src/lib/services/electron-native.service.ts b/projects/ucap-webmessenger-native-electron/src/lib/services/electron-native.service.ts
index 9836473a..a1fe7ca5 100644
--- a/projects/ucap-webmessenger-native-electron/src/lib/services/electron-native.service.ts
+++ b/projects/ucap-webmessenger-native-electron/src/lib/services/electron-native.service.ts
@@ -47,14 +47,12 @@ export class ElectronNativeService implements NativeService {
     this.ipcRenderer.send(NotificationChannel.CloseAllNotify);
   }
 
-  checkForUpdates(): Observable<boolean> {
-    return new Observable<boolean>(subscriber => {
+  checkForUpdates(): Promise<boolean> {
+    return new Promise<boolean>((resolve, reject) => {
       try {
-        subscriber.next(this.ipcRenderer.sendSync(UpdaterChannel.Check));
+        resolve(this.ipcRenderer.sendSync(UpdaterChannel.Check));
       } catch (error) {
-        subscriber.error(error);
-      } finally {
-        subscriber.complete();
+        reject(error);
       }
     });
   }
@@ -63,14 +61,12 @@ export class ElectronNativeService implements NativeService {
     this.ipcRenderer.send(FileChannel.ShowImageViewer);
   }
 
-  readFile(path: string): Observable<Buffer> {
-    return new Observable<Buffer>(subscriber => {
+  readFile(path: string): Promise<Buffer> {
+    return new Promise<Buffer>((resolve, reject) => {
       try {
-        subscriber.next(this.ipcRenderer.sendSync(FileChannel.ReadFile, path));
+        resolve(this.ipcRenderer.sendSync(FileChannel.ReadFile, path));
       } catch (error) {
-        subscriber.error(error);
-      } finally {
-        subscriber.complete();
+        reject(error);
       }
     });
   }
@@ -78,22 +74,22 @@ export class ElectronNativeService implements NativeService {
   saveFile(
     buffer: Buffer,
     fileName: string,
+    mimeType: string,
     path?: string
-  ): Observable<string> {
-    return new Observable<string>(subscriber => {
+  ): Promise<string> {
+    return new Promise<string>((resolve, reject) => {
       try {
-        subscriber.next(
+        resolve(
           this.ipcRenderer.sendSync(
             FileChannel.SaveFile,
             buffer,
             fileName,
+            mimeType,
             path
           )
         );
       } catch (error) {
-        subscriber.error(error);
-      } finally {
-        subscriber.complete();
+        reject(error);
       }
     });
   }
diff --git a/projects/ucap-webmessenger-native-electron/src/lib/translate/electron-loader.ts b/projects/ucap-webmessenger-native-electron/src/lib/translate/electron-loader.ts
index 1195ae26..6ca66160 100644
--- a/projects/ucap-webmessenger-native-electron/src/lib/translate/electron-loader.ts
+++ b/projects/ucap-webmessenger-native-electron/src/lib/translate/electron-loader.ts
@@ -1,7 +1,6 @@
 import { TranslateLoader } from '@ngx-translate/core';
 import { Observable } from 'rxjs';
 import { NativeService } from '@ucap-webmessenger/native';
-import { take, map } from 'rxjs/operators';
 import { Injectable } from '@angular/core';
 
 @Injectable({
@@ -18,13 +17,18 @@ export class TranslateLoaderService implements TranslateLoader {
    * Gets the translations from the server
    */
   public getTranslation(lang: string): Observable<any> {
-    return this.nativeService
-      .readFile(`${this.prefix}${lang}.${this.suffix}`)
-      .pipe(
-        take(1),
-        map(buf => {
-          return JSON.parse(buf.toString());
+    return new Observable<any>(subscriber => {
+      this.nativeService
+        .readFile(`${this.prefix}${lang}.${this.suffix}`)
+        .then(buffer => {
+          subscriber.next(JSON.parse(buffer.toString('utf-8')));
         })
-      );
+        .catch(reason => {
+          subscriber.error(reason);
+        })
+        .finally(() => {
+          subscriber.complete();
+        });
+    });
   }
 }
diff --git a/projects/ucap-webmessenger-native/src/lib/services/native.service.ts b/projects/ucap-webmessenger-native/src/lib/services/native.service.ts
index cdfac5de..af261391 100644
--- a/projects/ucap-webmessenger-native/src/lib/services/native.service.ts
+++ b/projects/ucap-webmessenger-native/src/lib/services/native.service.ts
@@ -11,16 +11,17 @@ export abstract class NativeService {
   abstract notify(noti: NotificationRequest): void;
   abstract closeAllNotify(): void;
 
-  abstract checkForUpdates(): Observable<boolean>;
+  abstract checkForUpdates(): Promise<boolean>;
 
   abstract showImageViewer(): void;
 
   abstract saveFile(
     buffer: Buffer,
     fileName: string,
+    mimeType: string,
     path?: string
-  ): Observable<string>;
-  abstract readFile(path: string): Observable<Buffer>;
+  ): Promise<string>;
+  abstract readFile(path: string): Promise<Buffer>;
 
   abstract windowStateChanged(): Observable<WindowState>;
   abstract windowClose(): void;
diff --git a/projects/ucap-webmessenger-protocol/src/lib/services/protocol.service.ts b/projects/ucap-webmessenger-protocol/src/lib/services/protocol.service.ts
index 925a3769..3341ff6d 100644
--- a/projects/ucap-webmessenger-protocol/src/lib/services/protocol.service.ts
+++ b/projects/ucap-webmessenger-protocol/src/lib/services/protocol.service.ts
@@ -191,12 +191,18 @@ export class ProtocolService {
 
       responseSubject = new Subject<ProtocolMessage>().pipe(
         finalize(() => {
+          this.logger.debug(
+            'ProtocolService::pendingRequests.finalize',
+            requestId
+          );
+
           if (this.pendingRequests.has(requestId)) {
             this.pendingRequests.delete(requestId);
           }
           this.logger.debug(
             'ProtocolService::pendingRequests.size',
-            this.pendingRequests.size
+            this.pendingRequests.size,
+            this.pendingRequests
           );
         })
       ) as Subject<ProtocolMessage>;
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer.component.html b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer.component.html
index 6c7d3d74..caced57b 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer.component.html
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer.component.html
@@ -6,35 +6,35 @@
     *ngSwitchCase="FileViewerType.Document"
     [fileInfo]="fileInfo"
     [fileDownloadUrl]="fileDownloadUrl"
-    (download)="onDownload()"
+    (download)="onDownload($event)"
     (closed)="onClosedViewer()"
   ></ucap-document-viewer>
   <ucap-image-viewer
     *ngSwitchCase="FileViewerType.Image"
     [fileInfo]="fileInfo"
     [fileDownloadUrl]="fileDownloadUrl"
-    (download)="onDownload()"
+    (download)="onDownload($event)"
     (closed)="onClosedViewer()"
   ></ucap-image-viewer>
   <ucap-sound-viewer
     *ngSwitchCase="FileViewerType.Sound"
     [fileInfo]="fileInfo"
     [fileDownloadUrl]="fileDownloadUrl"
-    (download)="onDownload()"
+    (download)="onDownload($event)"
     (closed)="onClosedViewer()"
   ></ucap-sound-viewer>
   <ucap-video-viewer
     *ngSwitchCase="FileViewerType.Video"
     [fileInfo]="fileInfo"
     [fileDownloadUrl]="fileDownloadUrl"
-    (download)="onDownload()"
+    (download)="onDownload($event)"
     (closed)="onClosedViewer()"
   ></ucap-video-viewer>
   <ucap-binary-viewer
     *ngSwitchDefault
     [fileInfo]="fileInfo"
     [fileDownloadUrl]="fileDownloadUrl"
-    (download)="onDownload()"
+    (download)="onDownload($event)"
     (closed)="onClosedViewer()"
   ></ucap-binary-viewer>
 </div>
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer.component.ts b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer.component.ts
index 54c0140a..74aa88a1 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer.component.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer.component.ts
@@ -3,12 +3,13 @@ import { ucapAnimations } from '../animations';
 import { FileEventJson } from '@ucap-webmessenger/protocol-event';
 import { FileViewerType } from '../types/file-viewer.type';
 import { FileType } from '@ucap-webmessenger/protocol-file';
+import { FileDownloadItem } from '@ucap-webmessenger/api-common';
 
 @Component({
   selector: 'ucap-file-viewer',
   templateUrl: './file-viewer.component.html',
   styleUrls: ['./file-viewer.component.scss'],
-  animations: ucapAnimations
+  animations: ucapAnimations,
 })
 export class FileViewerComponent implements OnInit {
   @Input()
@@ -18,7 +19,7 @@ export class FileViewerComponent implements OnInit {
   fileDownloadUrl: string;
 
   @Output()
-  download = new EventEmitter<void>();
+  download = new EventEmitter<FileDownloadItem>();
 
   @Output()
   closed = new EventEmitter<void>();
@@ -44,8 +45,8 @@ export class FileViewerComponent implements OnInit {
         return FileViewerType.Binary;
     }
   }
-  onDownload(): void {
-    this.download.emit();
+  onDownload(fileDownloadItem: FileDownloadItem): void {
+    this.download.emit(fileDownloadItem);
   }
 
   onClosedViewer(): void {
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/binary-viewer.component.html b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/binary-viewer.component.html
index db060695..32a33be9 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/binary-viewer.component.html
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/binary-viewer.component.html
@@ -24,6 +24,11 @@
       Close
     </button>
   </mat-toolbar>
+  <mat-progress-bar
+    *ngIf="fileDownloadItem && fileDownloadItem.downloadingProgress$"
+    mode="determinate"
+    [value]="fileDownloadItem.downloadingProgress$ | async"
+  ></mat-progress-bar>
   <div class="ucap-binary-viewer-body">
     <div
       class="ucap-binary-viewer-content-wrapper"
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/binary-viewer.component.ts b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/binary-viewer.component.ts
index 7508c62c..ac4b1a12 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/binary-viewer.component.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/binary-viewer.component.ts
@@ -2,12 +2,13 @@ import { Component, OnInit, Input, Output, EventEmitter } from '@angular/core';
 import { ucapAnimations } from '../../animations';
 import { FileEventJson } from '@ucap-webmessenger/protocol-event';
 import { DeviceType } from '@ucap-webmessenger/core';
+import { FileDownloadItem } from '@ucap-webmessenger/api-common';
 
 @Component({
   selector: 'ucap-binary-viewer',
   templateUrl: './binary-viewer.component.html',
   styleUrls: ['./binary-viewer.component.scss'],
-  animations: ucapAnimations
+  animations: ucapAnimations,
 })
 export class BinaryViewerComponent implements OnInit {
   @Input()
@@ -17,17 +18,20 @@ export class BinaryViewerComponent implements OnInit {
   fileDownloadUrl: string;
 
   @Output()
-  download = new EventEmitter<void>();
+  download = new EventEmitter<FileDownloadItem>();
 
   @Output()
   closed = new EventEmitter<void>();
 
+  fileDownloadItem: FileDownloadItem;
+
   constructor() {}
 
   ngOnInit() {}
 
   onClickDownload(): void {
-    this.download.emit();
+    this.fileDownloadItem = new FileDownloadItem();
+    this.download.emit(this.fileDownloadItem);
   }
 
   onClickClose(): void {
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/document-viewer.component.html b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/document-viewer.component.html
index 0f1561d1..b9df4234 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/document-viewer.component.html
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/document-viewer.component.html
@@ -15,4 +15,9 @@
       >delete</mat-icon
     >
   </mat-toolbar>
+  <mat-progress-bar
+    *ngIf="fileDownloadItem && fileDownloadItem.downloadingProgress$"
+    mode="determinate"
+    [value]="fileDownloadItem.downloadingProgress$ | async"
+  ></mat-progress-bar>
 </div>
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/document-viewer.component.ts b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/document-viewer.component.ts
index 2b411d6a..eefa6939 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/document-viewer.component.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/document-viewer.component.ts
@@ -2,12 +2,13 @@ import { Component, OnInit, Input, Output, EventEmitter } from '@angular/core';
 import { ucapAnimations } from '../../animations';
 import { FileEventJson } from '@ucap-webmessenger/protocol-event';
 import { DeviceType } from '@ucap-webmessenger/core';
+import { FileDownloadItem } from '@ucap-webmessenger/api-common';
 
 @Component({
   selector: 'ucap-document-viewer',
   templateUrl: './document-viewer.component.html',
   styleUrls: ['./document-viewer.component.scss'],
-  animations: ucapAnimations
+  animations: ucapAnimations,
 })
 export class DocumentViewerComponent implements OnInit {
   @Input()
@@ -17,16 +18,21 @@ export class DocumentViewerComponent implements OnInit {
   fileDownloadUrl: string;
 
   @Output()
-  download = new EventEmitter<void>();
+  download = new EventEmitter<FileDownloadItem>();
 
   @Output()
   closed = new EventEmitter<void>();
 
+  fileDownloadItem: FileDownloadItem;
+
   constructor() {}
 
   ngOnInit() {}
 
-  onClickDownload(): void {}
+  onClickDownload(): void {
+    this.fileDownloadItem = new FileDownloadItem();
+    this.download.emit(this.fileDownloadItem);
+  }
 
   onClickClose(): void {
     this.closed.emit();
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/image-viewer.component.html b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/image-viewer.component.html
index 262a90e7..343a55d6 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/image-viewer.component.html
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/image-viewer.component.html
@@ -1,11 +1,22 @@
 <div class="ucap-image-viewer-container">
-  <mat-toolbar  class="ucap-image-viewer-header bg-primary-dark">
+  <mat-toolbar class="ucap-image-viewer-header bg-primary-dark">
     <!--<mat-icon class="ucap-image-viewer-icon">image</mat-icon>-->
-    <svg xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 24 24" fill="none" stroke="currentColor"
-      stroke-width="2" stroke-linecap="butt" stroke-linejoin="round" class="ucap-image-viewer-icon">
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      width="21"
+      height="21"
+      viewBox="0 0 24 24"
+      fill="none"
+      stroke="currentColor"
+      stroke-width="2"
+      stroke-linecap="butt"
+      stroke-linejoin="round"
+      class="ucap-image-viewer-icon"
+    >
       <rect x="3" y="3" width="18" height="18" rx="2" />
       <circle cx="8.5" cy="8.5" r="1.5" />
-      <path d="M20.4 14.5L16 10 4 20" /></svg>
+      <path d="M20.4 14.5L16 10 4 20" />
+    </svg>
     <span class="ucap-image-viewer-title">{{ fileInfo.fileName }}</span>
     <span class="ucap-image-viewer-spacer"></span>
 
@@ -18,9 +29,20 @@
     >
       <!--<mat-icon>settings_overscan</mat-icon>-->
 
-      <svg xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 24 24" fill="none" stroke="currentColor"
-        stroke-width="2" stroke-linecap="butt" stroke-linejoin="round">
-        <path d="M3.8 3.8l16.4 16.4M20.2 3.8L3.8 20.2M15 3h6v6M9 3H3v6M15 21h6v-6M9 21H3v-6" />
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        width="21"
+        height="21"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="butt"
+        stroke-linejoin="round"
+      >
+        <path
+          d="M3.8 3.8l16.4 16.4M20.2 3.8L3.8 20.2M15 3h6v6M9 3H3v6M15 21h6v-6M9 21H3v-6"
+        />
       </svg>
     </button>
     <button
@@ -31,7 +53,21 @@
       aria-label=""
     >
       <!--<mat-icon>zoom_out</mat-icon>-->
-      <svg xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="butt" stroke-linejoin="round"><circle cx="11" cy="11" r="8"></circle><line x1="21" y1="21" x2="16.65" y2="16.65"></line><line x1="8" y1="11" x2="14" y2="11"></line></svg>
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        width="21"
+        height="21"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="butt"
+        stroke-linejoin="round"
+      >
+        <circle cx="11" cy="11" r="8"></circle>
+        <line x1="21" y1="21" x2="16.65" y2="16.65"></line>
+        <line x1="8" y1="11" x2="14" y2="11"></line>
+      </svg>
     </button>
     <button
       mat-icon-button
@@ -41,8 +77,17 @@
       aria-label=""
     >
       <!--<mat-icon>zoom_in</mat-icon>-->
-      <svg xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 24 24" fill="none" stroke="currentColor"
-        stroke-width="2" stroke-linecap="butt" stroke-linejoin="round">
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        width="21"
+        height="21"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="butt"
+        stroke-linejoin="round"
+      >
         <circle cx="11" cy="11" r="8"></circle>
         <line x1="21" y1="21" x2="16.65" y2="16.65"></line>
         <line x1="11" y1="8" x2="11" y2="14"></line>
@@ -58,25 +103,51 @@
       (click)="onClickDownload()"
     >
       <!--<mat-icon>get_app</mat-icon>-->
-      <svg xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 24 24" fill="none" stroke="currentColor"
-        stroke-width="2" stroke-linecap="butt" stroke-linejoin="round">
-        <path d="M3 15v4c0 1.1.9 2 2 2h14a2 2 0 0 0 2-2v-4M17 9l-5 5-5-5M12 12.8V2.5" /></svg>
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        width="21"
+        height="21"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="butt"
+        stroke-linejoin="round"
+      >
+        <path
+          d="M3 15v4c0 1.1.9 2 2 2h14a2 2 0 0 0 2-2v-4M17 9l-5 5-5-5M12 12.8V2.5"
+        />
+      </svg>
     </button>
     <span class="stroke-bar"></span>
     <button
       mat-icon-button
       color="warn"
       class="ucap-image-viewer-action btn-close"
-       matTooltip="뷰어닫기"
+      matTooltip="뷰어닫기"
       (click)="onClickClose()"
     >
-      <svg xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 24 24" fill="none" stroke="currentColor"
-        stroke-width="2" stroke-linecap="butt" stroke-linejoin="round">
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        width="21"
+        height="21"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="butt"
+        stroke-linejoin="round"
+      >
         <line x1="18" y1="6" x2="6" y2="18"></line>
         <line x1="6" y1="6" x2="18" y2="18"></line>
       </svg>
     </button>
   </mat-toolbar>
+  <mat-progress-bar
+    *ngIf="fileDownloadItem && fileDownloadItem.downloadingProgress$"
+    mode="determinate"
+    [value]="fileDownloadItem.downloadingProgress$ | async"
+  ></mat-progress-bar>
   <div class="ucap-image-viewer-body">
     <div
       class="ucap-image-viewer-image-wrapper"
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/image-viewer.component.ts b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/image-viewer.component.ts
index 59c3f030..aca93824 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/image-viewer.component.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/image-viewer.component.ts
@@ -2,13 +2,16 @@ import { Component, OnInit, Input, Output, EventEmitter } from '@angular/core';
 import { ucapAnimations } from '../../animations';
 import { FileEventJson } from '@ucap-webmessenger/protocol-event';
 import { DeviceType } from '@ucap-webmessenger/core';
-import { CommonApiService } from '@ucap-webmessenger/api-common';
+import {
+  CommonApiService,
+  FileDownloadItem,
+} from '@ucap-webmessenger/api-common';
 
 @Component({
   selector: 'ucap-image-viewer',
   templateUrl: './image-viewer.component.html',
   styleUrls: ['./image-viewer.component.scss'],
-  animations: ucapAnimations
+  animations: ucapAnimations,
 })
 export class ImageViewerComponent implements OnInit {
   @Input()
@@ -21,14 +24,17 @@ export class ImageViewerComponent implements OnInit {
   closed = new EventEmitter<void>();
 
   @Output()
-  download = new EventEmitter<void>();
+  download = new EventEmitter<FileDownloadItem>();
+
+  fileDownloadItem: FileDownloadItem;
 
   constructor() {}
 
   ngOnInit() {}
 
   onClickDownload(): void {
-    this.download.emit();
+    this.fileDownloadItem = new FileDownloadItem();
+    this.download.emit(this.fileDownloadItem);
   }
 
   onClickClose(): void {
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/sound-viewer.component.html b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/sound-viewer.component.html
index 6d3a0430..1d791071 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/sound-viewer.component.html
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/sound-viewer.component.html
@@ -22,6 +22,11 @@
       Close
     </button>
   </mat-toolbar>
+  <mat-progress-bar
+    *ngIf="fileDownloadItem && fileDownloadItem.downloadingProgress$"
+    mode="determinate"
+    [value]="fileDownloadItem.downloadingProgress$ | async"
+  ></mat-progress-bar>
   <div class="ucap-sound-viewer-body">
     <div
       class="ucap-sound-viewer-sound-icon"
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/sound-viewer.component.ts b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/sound-viewer.component.ts
index d3b39457..2278ab04 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/sound-viewer.component.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/sound-viewer.component.ts
@@ -5,17 +5,18 @@ import {
   Output,
   EventEmitter,
   ViewChild,
-  ElementRef
+  ElementRef,
 } from '@angular/core';
 import { ucapAnimations } from '../../animations';
 import { FileEventJson } from '@ucap-webmessenger/protocol-event';
 import { MatSlider, MatSliderChange } from '@angular/material';
+import { FileDownloadItem } from '@ucap-webmessenger/api-common';
 
 @Component({
   selector: 'ucap-sound-viewer',
   templateUrl: './sound-viewer.component.html',
   styleUrls: ['./sound-viewer.component.scss'],
-  animations: ucapAnimations
+  animations: ucapAnimations,
 })
 export class SoundViewerComponent implements OnInit {
   @Input()
@@ -25,7 +26,7 @@ export class SoundViewerComponent implements OnInit {
   fileDownloadUrl: string;
 
   @Output()
-  download = new EventEmitter<void>();
+  download = new EventEmitter<FileDownloadItem>();
 
   @Output()
   closed = new EventEmitter<void>();
@@ -41,6 +42,7 @@ export class SoundViewerComponent implements OnInit {
   currentTime = 0;
   volume = 0.1;
   loading = false;
+  fileDownloadItem: FileDownloadItem;
 
   constructor() {}
 
@@ -90,7 +92,8 @@ export class SoundViewerComponent implements OnInit {
   }
 
   onClickDownload(): void {
-    this.download.emit();
+    this.fileDownloadItem = new FileDownloadItem();
+    this.download.emit(this.fileDownloadItem);
   }
 
   onClickClose(): void {
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/video-viewer.component.html b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/video-viewer.component.html
index 43b5bf3e..9a3f9778 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/video-viewer.component.html
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/video-viewer.component.html
@@ -1,8 +1,18 @@
 <div class="ucap-video-viewer-container">
   <mat-toolbar color="accent" class="ucap-video-viewer-header">
     <!--<mat-icon class="ucap-video-viewer-icon">video_label</mat-icon>-->
-    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor"
-      stroke-width="2" stroke-linecap="butt" stroke-linejoin="round"  class="ucap-video-viewer-icon">
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      width="24"
+      height="24"
+      viewBox="0 0 24 24"
+      fill="none"
+      stroke="currentColor"
+      stroke-width="2"
+      stroke-linecap="butt"
+      stroke-linejoin="round"
+      class="ucap-video-viewer-icon"
+    >
       <rect x="2" y="2" width="20" height="20" rx="2.18" ry="2.18"></rect>
       <line x1="7" y1="2" x2="7" y2="22"></line>
       <line x1="17" y1="2" x2="17" y2="22"></line>
@@ -23,9 +33,20 @@
       (click)="onClickDownload()"
     >
       <!--<mat-icon>get_app</mat-icon>-->
-      <svg xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 24 24" fill="none" stroke="currentColor"
-        stroke-width="2" stroke-linecap="butt" stroke-linejoin="round">
-        <path d="M3 15v4c0 1.1.9 2 2 2h14a2 2 0 0 0 2-2v-4M17 9l-5 5-5-5M12 12.8V2.5" />
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        width="21"
+        height="21"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="butt"
+        stroke-linejoin="round"
+      >
+        <path
+          d="M3 15v4c0 1.1.9 2 2 2h14a2 2 0 0 0 2-2v-4M17 9l-5 5-5-5M12 12.8V2.5"
+        />
       </svg>
     </button>
     <span class="stroke-bar"></span>
@@ -33,16 +54,30 @@
       mat-icon-button
       color="warn"
       class="ucap-image-viewer-action btn-close"
-       matTooltip="뷰어닫기"
+      matTooltip="뷰어닫기"
       (click)="onClickClose()"
     >
-      <svg xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 24 24" fill="none" stroke="currentColor"
-        stroke-width="2" stroke-linecap="butt" stroke-linejoin="round">
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        width="21"
+        height="21"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="butt"
+        stroke-linejoin="round"
+      >
         <line x1="18" y1="6" x2="6" y2="18"></line>
         <line x1="6" y1="6" x2="18" y2="18"></line>
       </svg>
     </button>
   </mat-toolbar>
+  <mat-progress-bar
+    *ngIf="fileDownloadItem && fileDownloadItem.downloadingProgress$"
+    mode="determinate"
+    [value]="fileDownloadItem.downloadingProgress$ | async"
+  ></mat-progress-bar>
   <div class="ucap-video-viewer-body">
     <div
       class="ucap-video-viewer-video-icon"
diff --git a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/video-viewer.component.ts b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/video-viewer.component.ts
index c58efc2c..37b82847 100644
--- a/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/video-viewer.component.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/components/file-viewer/video-viewer.component.ts
@@ -5,17 +5,18 @@ import {
   Output,
   EventEmitter,
   ViewChild,
-  ElementRef
+  ElementRef,
 } from '@angular/core';
 import { ucapAnimations } from '../../animations';
 import { FileEventJson } from '@ucap-webmessenger/protocol-event';
 import { MatSlider, MatSliderChange } from '@angular/material';
+import { FileDownloadItem } from '@ucap-webmessenger/api-common';
 
 @Component({
   selector: 'ucap-video-viewer',
   templateUrl: './video-viewer.component.html',
   styleUrls: ['./video-viewer.component.scss'],
-  animations: ucapAnimations
+  animations: ucapAnimations,
 })
 export class VideoViewerComponent implements OnInit {
   @Input()
@@ -25,7 +26,7 @@ export class VideoViewerComponent implements OnInit {
   fileDownloadUrl: string;
 
   @Output()
-  download = new EventEmitter<void>();
+  download = new EventEmitter<FileDownloadItem>();
 
   @Output()
   closed = new EventEmitter<void>();
@@ -41,6 +42,7 @@ export class VideoViewerComponent implements OnInit {
   currentTime = 0;
   volume = 0.1;
   loading = false;
+  fileDownloadItem: FileDownloadItem;
 
   constructor() {}
 
@@ -90,7 +92,8 @@ export class VideoViewerComponent implements OnInit {
   }
 
   onClickDownload(): void {
-    this.download.emit();
+    this.fileDownloadItem = new FileDownloadItem();
+    this.download.emit(this.fileDownloadItem);
   }
 
   onClickClose(): void {