diff --git a/projects/ucap-webmessenger-api-common/src/lib/services/common-api.service.ts b/projects/ucap-webmessenger-api-common/src/lib/services/common-api.service.ts
index 078a8743..d95167eb 100644
--- a/projects/ucap-webmessenger-api-common/src/lib/services/common-api.service.ts
+++ b/projects/ucap-webmessenger-api-common/src/lib/services/common-api.service.ts
@@ -219,6 +219,15 @@ export class CommonApiService {
     return 0 === rejected.length ? undefined : rejected;
   }
 
+  public checkInvalidMediaMimeForFileTalkForFileList(
+    fileList: FileList
+  ): Promise<string[]> {
+    const files: File[] = [];
+    for (let i = 0; i < fileList.length; i++) {
+      files.push(fileList.item(i));
+    }
+    return this.checkInvalidMediaMimeForFileTalk(files);
+  }
   public checkInvalidMediaMimeForFileTalk(files: File[]): Promise<string[]> {
     return new Promise<string[]>(async (resolve, reject) => {
       const mediaFiles = this.mediaFiles(files);
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 510f63c8..c2fefd28 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
@@ -1075,10 +1075,13 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
       roomSeq: this.roomInfoSubject.value.roomSeq
     };
 
-    const files: File[] = fileUploadItems.map(fui => fui.file);
-
     const allObservables: Observable<FileTalkSaveResponse>[] = [];
 
+    /**
+     * 확장자, real mime 체크는 이전 단계에서 진행하고 여기서는 oversize 만 체크함.
+     * cf) acceptableExtensionForFileTalk, checkInvalidMediaMimeForFileTalkForFileList
+     */
+    const files: File[] = fileUploadItems.map(fui => fui.file);
     const fileAllowSize =
       !!this.sessionVerInfo && this.sessionVerInfo.fileAllowSize
         ? this.sessionVerInfo.fileAllowSize
@@ -1105,66 +1108,6 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewInit {
       }
     }
 
-    // this.commonApiService.mimeCheckForImageAndVideoFiles(
-    //   fileUploadItems.map(fui => fui.file)
-    // );
-
-    const checkExt = this.commonApiService.acceptableExtensionForFileTalk(
-      files.map(f => FileUtil.getExtension(f.name))
-    );
-    if (!!checkExt) {
-      if (!!this.fileUploadQueue) {
-        this.fileUploadQueue.onUploadComplete();
-      }
-
-      this.snackBarService.openFromComponent<
-        AlertSnackbarComponent,
-        AlertSnackbarData
-      >(AlertSnackbarComponent, {
-        duration: 1000,
-        verticalPosition: 'bottom',
-        horizontalPosition: 'center',
-        data: {
-          html: this.translateService.instant(
-            'common.file.errors.notSupporedType',
-            {
-              supporedType: checkExt.join(',')
-            }
-          )
-        }
-      });
-
-      return;
-    }
-
-    const fakeMedias = await this.commonApiService.checkInvalidMediaMimeForFileTalk(
-      files
-    );
-    if (!!fakeMedias) {
-      if (!!this.fileUploadQueue) {
-        this.fileUploadQueue.onUploadComplete();
-      }
-
-      this.snackBarService.openFromComponent<
-        AlertSnackbarComponent,
-        AlertSnackbarData
-      >(AlertSnackbarComponent, {
-        duration: 3000,
-        verticalPosition: 'bottom',
-        horizontalPosition: 'center',
-        data: {
-          html: this.translateService.instant(
-            'common.file.errors.notAcceptableMime',
-            {
-              supporedType: fakeMedias.length > 0 ? fakeMedias.join(',') : ''
-            }
-          )
-        }
-      });
-
-      return;
-    }
-
     for (const fileUploadItem of fileUploadItems) {
       let thumbnail: File;
       if (
diff --git a/projects/ucap-webmessenger-ui-chat/src/lib/components/form.component.ts b/projects/ucap-webmessenger-ui-chat/src/lib/components/form.component.ts
index d5a551e6..80c5b35e 100644
--- a/projects/ucap-webmessenger-ui-chat/src/lib/components/form.component.ts
+++ b/projects/ucap-webmessenger-ui-chat/src/lib/components/form.component.ts
@@ -5,11 +5,21 @@ import {
   EventEmitter,
   ViewChild,
   ElementRef,
-  Input
+  Input,
+  NgZone
 } from '@angular/core';
 import { NgForm } from '@angular/forms';
 import { FileUploadItem } from '@ucap-webmessenger/api';
-import { FileUploadQueueComponent } from '@ucap-webmessenger/ui';
+import {
+  FileUploadQueueComponent,
+  SnackBarService,
+  AlertSnackbarComponent,
+  AlertSnackbarData
+} from '@ucap-webmessenger/ui';
+import { CommonApiService } from '@ucap-webmessenger/api-common';
+import { NGXLogger } from 'ngx-logger';
+import { FileUtil } from '@ucap-webmessenger/core';
+import { TranslateService } from '@ngx-translate/core';
 
 @Component({
   selector: 'ucap-chat-form',
@@ -43,7 +53,13 @@ export class FormComponent implements OnInit {
   @ViewChild('fileInput', { static: false })
   fileInput: ElementRef<HTMLInputElement>;
 
-  constructor() {}
+  constructor(
+    private translateService: TranslateService,
+    private commonApiService: CommonApiService,
+    private snackBarService: SnackBarService,
+    private readonly ngZone: NgZone,
+    private logger: NGXLogger
+  ) {}
 
   ngOnInit() {}
 
@@ -64,17 +80,27 @@ export class FormComponent implements OnInit {
   }
 
   onChangeFileInput() {
-    const fileUploadItems = FileUploadItem.fromFiles(
-      this.fileInput.nativeElement.files
-    );
+    const self = this;
+    const fileList = this.fileInput.nativeElement.files;
+    this.validUploadFile(fileList)
+      .then(async result => {
+        if (!result) {
+          self.fileInput.nativeElement.value = '';
+          return;
+        } else {
+          const fileUploadItems = FileUploadItem.fromFiles(fileList);
 
-    if (!!this.fileUploadQueue) {
-      this.fileUploadQueue.onFileSelected(fileUploadItems);
-    }
-
-    this.sendFiles.emit(fileUploadItems);
-
-    this.fileInput.nativeElement.value = '';
+          if (!!self.fileUploadQueue) {
+            self.fileUploadQueue.onFileSelected(fileUploadItems);
+          }
+          self.fileInput.nativeElement.value = '';
+          self.sendFiles.emit(fileUploadItems);
+        }
+      })
+      .catch(err => {
+        self.fileInput.nativeElement.value = '';
+        this.logger.error(err);
+      });
   }
 
   onClickStickerSelector() {
@@ -90,4 +116,62 @@ export class FormComponent implements OnInit {
 
     this.clipboardPaste.emit(event);
   }
+
+  async validUploadFile(fileList: FileList): Promise<boolean> {
+    let valid = true;
+
+    const checkExt = this.commonApiService.acceptableExtensionForFileTalk(
+      FileUtil.getExtensions(fileList)
+    );
+    if (!!checkExt) {
+      this.ngZone.run(() => {
+        this.snackBarService.openFromComponent<
+          AlertSnackbarComponent,
+          AlertSnackbarData
+        >(AlertSnackbarComponent, {
+          duration: 1000,
+          verticalPosition: 'bottom',
+          horizontalPosition: 'center',
+          data: {
+            html: this.translateService.instant(
+              'common.file.errors.notSupporedType',
+              {
+                supporedType: checkExt.join(',')
+              }
+            )
+          }
+        });
+      });
+      valid = false;
+      return valid;
+    }
+
+    const fakeMedia = await this.commonApiService.checkInvalidMediaMimeForFileTalkForFileList(
+      fileList
+    );
+    if (!!fakeMedia) {
+      this.ngZone.run(() => {
+        this.snackBarService.openFromComponent<
+          AlertSnackbarComponent,
+          AlertSnackbarData
+        >(AlertSnackbarComponent, {
+          duration: 1000,
+          verticalPosition: 'bottom',
+          horizontalPosition: 'center',
+          data: {
+            html: this.translateService.instant(
+              'common.file.errors.notAcceptableMime',
+              {
+                supporedType: fakeMedia.join(',')
+              }
+            )
+          }
+        });
+      });
+      valid = false;
+      return valid;
+    }
+
+    return valid;
+  }
 }
diff --git a/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.ts b/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.ts
index 6938aaea..20a4a981 100644
--- a/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.ts
+++ b/projects/ucap-webmessenger-ui-message/src/lib/components/write.component.ts
@@ -173,37 +173,41 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
     const self = this;
     this.fileInput.nativeElement.onchange = async () => {
       const fileList: FileList = self.fileInput.nativeElement.files;
+      this.validUploadFile(fileList)
+        .then(async result => {
+          if (!result) {
+            return;
+          } else {
+            for (let i = 0; i < fileList.length; i++) {
+              const file = fileList.item(i);
 
-      if (!this.validUploadFile(fileList)) {
-        return;
-      }
+              const dataUrl = await FileUtil.fromBlobToDataUrl(file);
+              const img = document.createElement('img');
+              img.src = dataUrl as string;
+              img.setAttribute('style', 'max-height:250px; max-width:250px;');
+              img[ATTR_FILE] = file;
+              self.insertNode(img);
 
-      this.validUploadFile(fileList).then(async result => {
-        if (!result) {
-          return;
-        } else {
-          for (let i = 0; i < fileList.length; i++) {
-            const file = fileList.item(i);
+              const empty = document.createElement('div');
+              empty.innerHTML = '&nbsp;<br/>';
+              self.insertNode(empty, true);
+            }
 
-            const dataUrl = await FileUtil.fromBlobToDataUrl(file);
-            const img = document.createElement('img');
-            img.src = dataUrl as string;
-            img.setAttribute('style', 'max-height:250px; max-width:250px;');
-            img[ATTR_FILE] = file;
-            self.insertNode(img);
+            self.fileInput.nativeElement.value = '';
+            self.fileInput.nativeElement.onchange = undefined;
 
-            const empty = document.createElement('div');
-            empty.innerHTML = '&nbsp;<br/>';
-            self.insertNode(empty, true);
+            self.checkContentLength();
+            self.changeDetectorRef.detectChanges();
           }
-
+        })
+        .catch(err => {
           self.fileInput.nativeElement.value = '';
           self.fileInput.nativeElement.onchange = undefined;
 
           self.checkContentLength();
           self.changeDetectorRef.detectChanges();
-        }
-      });
+          this.logger.error(err);
+        });
     };
   }
 
@@ -213,24 +217,28 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
     const self = this;
     this.fileInput.nativeElement.onchange = () => {
       const fileList: FileList = this.fileInput.nativeElement.files;
-
-      if (!this.validUploadFile(fileList)) {
-        self.fileInput.nativeElement.value = '';
-        return;
-      }
-
-      if (!self.attachmentList) {
-        self.attachmentList = [];
-      }
-
-      for (let i = 0; i < fileList.length; i++) {
-        const file = fileList.item(i);
-        self.attachmentList.push(file);
-      }
-
-      self.changeDetectorRef.detectChanges();
-
-      self.fileInput.nativeElement.value = '';
+      this.validUploadFile(fileList)
+        .then(async result => {
+          if (!result) {
+            self.fileInput.nativeElement.value = '';
+            return;
+          } else {
+            if (!self.attachmentList) {
+              self.attachmentList = [];
+            }
+            for (let i = 0; i < fileList.length; i++) {
+              const file = fileList.item(i);
+              self.attachmentList.push(file);
+            }
+            self.fileInput.nativeElement.value = '';
+            self.changeDetectorRef.detectChanges();
+          }
+        })
+        .catch(err => {
+          self.fileInput.nativeElement.value = '';
+          self.changeDetectorRef.detectChanges();
+          this.logger.error(err);
+        });
     };
   }
 
@@ -289,12 +297,8 @@ export class WriteComponent implements OnInit, OnDestroy, AfterViewInit {
       return valid;
     }
 
-    const files: File[] = [];
-    for (let i = 0; i < fileList.length; i++) {
-      files.push(fileList.item(i));
-    }
-    const fakeMedia = await this.commonApiService.checkInvalidMediaMimeForFileTalk(
-      files
+    const fakeMedia = await this.commonApiService.checkInvalidMediaMimeForFileTalkForFileList(
+      fileList
     );
     if (!!fakeMedia) {
       this.ngZone.run(() => {
diff --git a/projects/ucap-webmessenger-ui/src/lib/directives/file-upload-for.directive.ts b/projects/ucap-webmessenger-ui/src/lib/directives/file-upload-for.directive.ts
index c7acba9e..082bfe9b 100644
--- a/projects/ucap-webmessenger-ui/src/lib/directives/file-upload-for.directive.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/directives/file-upload-for.directive.ts
@@ -5,12 +5,21 @@ import {
   HostListener,
   Output,
   Input,
-  AfterViewInit
+  AfterViewInit,
+  NgZone
 } from '@angular/core';
 
 import { NGXLogger } from 'ngx-logger';
 import { FileUploadQueueComponent } from '../components/file-upload-queue.component';
 import { FileUploadItem } from '@ucap-webmessenger/api';
+import { TranslateService } from '@ngx-translate/core';
+import { CommonApiService } from '@ucap-webmessenger/api-common';
+import { SnackBarService } from '../services/snack-bar.service';
+import { FileUtil } from '@ucap-webmessenger/core';
+import {
+  AlertSnackbarComponent,
+  AlertSnackbarData
+} from '../snackbars/alert.snackbar.component';
 
 @Directive({
   selector: 'input[ucapFileUploadFor], div[ucapFileUploadFor]'
@@ -33,7 +42,14 @@ export class FileUploadForDirective implements AfterViewInit {
 
   dragOver = false;
 
-  constructor(private elementRef: ElementRef, private logger: NGXLogger) {}
+  constructor(
+    private elementRef: ElementRef,
+    private logger: NGXLogger,
+    private translateService: TranslateService,
+    private commonApiService: CommonApiService,
+    private snackBarService: SnackBarService,
+    private readonly ngZone: NgZone
+  ) {}
 
   ngAfterViewInit(): void {}
 
@@ -93,17 +109,37 @@ export class FileUploadForDirective implements AfterViewInit {
     if (!this.isFileDrag(event.dataTransfer)) {
       return;
     }
+
+    const self = this;
     const files: FileList = event.dataTransfer.files;
 
-    const fileUploadItems = FileUploadItem.fromFiles(files);
-    this.fileSelected.emit(fileUploadItems);
     event.preventDefault();
     event.stopPropagation();
     this.elementRef.nativeElement.value = '';
     this.dragOver = false;
-    if (!!this.fileUploadQueue) {
-      this.fileUploadQueue.onDrop(fileUploadItems);
-    }
+
+    this.validUploadFile(files)
+      .then(async result => {
+        if (!result) {
+          if (!!this.fileUploadQueue) {
+            this.fileUploadQueue.onUploadComplete();
+          }
+          return;
+        } else {
+          const fileUploadItems = FileUploadItem.fromFiles(files);
+          self.fileSelected.emit(fileUploadItems);
+
+          if (!!self.fileUploadQueue) {
+            self.fileUploadQueue.onDrop(fileUploadItems);
+          }
+        }
+      })
+      .catch(err => {
+        if (!!this.fileUploadQueue) {
+          this.fileUploadQueue.onUploadComplete();
+        }
+        this.logger.error(err);
+      });
   }
 
   private isFileDrag(dataTransfer: DataTransfer): boolean {
@@ -121,4 +157,62 @@ export class FileUploadForDirective implements AfterViewInit {
 
     return true;
   }
+
+  private async validUploadFile(fileList: FileList): Promise<boolean> {
+    let valid = true;
+
+    const checkExt = this.commonApiService.acceptableExtensionForFileTalk(
+      FileUtil.getExtensions(fileList)
+    );
+    if (!!checkExt) {
+      this.ngZone.run(() => {
+        this.snackBarService.openFromComponent<
+          AlertSnackbarComponent,
+          AlertSnackbarData
+        >(AlertSnackbarComponent, {
+          duration: 1000,
+          verticalPosition: 'bottom',
+          horizontalPosition: 'center',
+          data: {
+            html: this.translateService.instant(
+              'common.file.errors.notSupporedType',
+              {
+                supporedType: checkExt.join(',')
+              }
+            )
+          }
+        });
+      });
+      valid = false;
+      return valid;
+    }
+
+    const fakeMedia = await this.commonApiService.checkInvalidMediaMimeForFileTalkForFileList(
+      fileList
+    );
+    if (!!fakeMedia) {
+      this.ngZone.run(() => {
+        this.snackBarService.openFromComponent<
+          AlertSnackbarComponent,
+          AlertSnackbarData
+        >(AlertSnackbarComponent, {
+          duration: 1000,
+          verticalPosition: 'bottom',
+          horizontalPosition: 'center',
+          data: {
+            html: this.translateService.instant(
+              'common.file.errors.notAcceptableMime',
+              {
+                supporedType: fakeMedia.join(',')
+              }
+            )
+          }
+        });
+      });
+      valid = false;
+      return valid;
+    }
+
+    return valid;
+  }
 }