diff --git a/projects/v3/src/app/components/topic/topic.component.html b/projects/v3/src/app/components/topic/topic.component.html
index c5c4497c0..a8c1e643c 100644
--- a/projects/v3/src/app/components/topic/topic.component.html
+++ b/projects/v3/src/app/components/topic/topic.component.html
@@ -52,7 +52,7 @@
       [title]="file.name"
       leadingIcon="document"
       lines="full"
-      [endingActionBtnIcons]="['download', 'search']"
+      [endingActionBtnIcons]="getFileActionIcons(file)"
       (actionBtnClick)="actionBtnClick(file, $event)"
     ></app-list-item>
 
diff --git a/projects/v3/src/app/components/topic/topic.component.spec.ts b/projects/v3/src/app/components/topic/topic.component.spec.ts
index b4bcfa9ec..04cbc66fd 100644
--- a/projects/v3/src/app/components/topic/topic.component.spec.ts
+++ b/projects/v3/src/app/components/topic/topic.component.spec.ts
@@ -155,16 +155,32 @@ describe('TopicComponent', () => {
       expect(utilsSpy.downloadFile).toHaveBeenCalled();
     });
 
-    it('should call previewFile when index 1 and url is filestack', () => {
+    it('should call previewFile when index 1 and url is filestack with supported type', () => {
       spyOn(component, 'previewFile');
       const file = { url: 'https://cdn.filestackcontent.com/abc123', name: 'doc.pdf' };
       component.actionBtnClick(file, 1);
       expect(component.previewFile).toHaveBeenCalledWith(file);
     });
 
+    it('should open video modal when index 1 and file is video', () => {
+      spyOn(component, 'previewVideoFile');
+      const file = { url: 'https://cdn.filestackcontent.com/abc123.mp4', name: 'video.mp4' };
+      component.actionBtnClick(file, 1);
+      expect(component.previewVideoFile).toHaveBeenCalledWith(file);
+    });
+
+    it('should open new tab when index 1 and url is filestack but file is audio', () => {
+      spyOn(window, 'open');
+      spyOn(component, 'previewFile');
+      const file = { url: 'https://cdn.filestackcontent.com/abc123', name: 'recording.mp3' };
+      component.actionBtnClick(file, 1);
+      expect(component.previewFile).not.toHaveBeenCalled();
+      expect(window.open).toHaveBeenCalledWith(file.url, '_blank');
+    });
+
     it('should open new tab when index 1 and url is not filestack', () => {
       spyOn(window, 'open');
-      const file = { url: 'https://example.com/video.mp4', name: 'video.mp4' };
+      const file = { url: 'https://example.com/document.pdf', name: 'document.pdf' };
       component.actionBtnClick(file, 1);
       expect(window.open).toHaveBeenCalledWith(file.url, '_blank');
       expect(notificationSpy.presentToast).toHaveBeenCalled();
@@ -177,4 +193,64 @@ describe('TopicComponent', () => {
       expect(window.open).toHaveBeenCalledWith(file.url, '_blank');
     });
   });
+
+  describe('getFileActionIcons', () => {
+    it('should return both download and search icons for filestack url with supported type', () => {
+      const file = { url: 'https://cdn.filestackcontent.com/abc123', name: 'document.pdf' };
+      const icons = component.getFileActionIcons(file);
+      expect(icons).toEqual(['download', 'search']);
+    });
+
+    it('should return both download and search icons for video files', () => {
+      const file = { url: 'https://cdn.filestackcontent.com/abc123.mp4', name: 'video.mp4' };
+      const icons = component.getFileActionIcons(file);
+      expect(icons).toEqual(['download', 'search']);
+    });
+
+    it('should return both download and search icons for non-filestack video', () => {
+      const file = { url: 'https://example.com/video.mp4', name: 'video.mp4' };
+      const icons = component.getFileActionIcons(file);
+      expect(icons).toEqual(['download', 'search']);
+    });
+
+    it('should return only download icon for filestack url with audio', () => {
+      const file = { url: 'https://cdn.filestackcontent.com/abc123', name: 'audio.mp3' };
+      const icons = component.getFileActionIcons(file);
+      expect(icons).toEqual(['download']);
+    });
+
+    it('should return only download icon for non-filestack non-video file', () => {
+      const file = { url: 'https://example.com/file.pdf', name: 'document.pdf' };
+      const icons = component.getFileActionIcons(file);
+      expect(icons).toEqual(['download']);
+    });
+
+    it('should return only download icon for non-mp4 video files', () => {
+      const file = { url: 'https://example.com/video.mov', name: 'video.mov' };
+      const icons = component.getFileActionIcons(file);
+      expect(icons).toEqual(['download']);
+    });
+  });
+
+  describe('previewVideoFile', () => {
+    it('should open video modal with file properties', async () => {
+      const modalSpy = jasmine.createSpyObj('Modal', ['present']);
+      spyOn(component['modalController'], 'create').and.returnValue(Promise.resolve(modalSpy));
+
+      const file = { url: 'https://example.com/video.mp4', name: 'test.mp4' };
+      await component.previewVideoFile(file);
+
+      expect(component['modalController'].create).toHaveBeenCalledWith({
+        component: jasmine.anything(),
+        componentProps: {
+          file: {
+            url: file.url,
+            name: file.name,
+            type: 'video/mp4',
+          },
+        },
+      });
+      expect(modalSpy.present).toHaveBeenCalled();
+    });
+  });
 });
diff --git a/projects/v3/src/app/components/topic/topic.component.ts b/projects/v3/src/app/components/topic/topic.component.ts
index 343b10ade..d03672d0e 100644
--- a/projects/v3/src/app/components/topic/topic.component.ts
+++ b/projects/v3/src/app/components/topic/topic.component.ts
@@ -11,6 +11,8 @@ import { NotificationsService } from '@v3/app/services/notifications.service';
 import { BehaviorSubject, exhaustMap, filter, finalize, Subject, Subscription, takeUntil } from 'rxjs';
 import { Task } from '@v3/app/services/activity.service';
 import { ComponentCleanupService } from '@v3/app/services/component-cleanup.service';
+import { ModalController } from '@ionic/angular';
+import { FilePopupComponent } from '../file-popup/file-popup.component';
 
 @Component({
   selector: 'app-topic',
@@ -52,6 +54,7 @@ export class TopicComponent implements OnInit, OnChanges, AfterViewChecked, OnDe
     private sanitizer: DomSanitizer,
     private cleanupService: ComponentCleanupService,
     private cdr: ChangeDetectorRef,
+    private modalController: ModalController,
     @Inject(DOCUMENT) private readonly document: Document
   ) {
     this.isMobile = this.utils.isMobile();
@@ -304,11 +307,14 @@ export class TopicComponent implements OnInit, OnChanges, AfterViewChecked, OnDe
         this.utils.downloadFile(file.url);
         break;
       case 1:
-        if (this._isFilestackUrl(file.url)) {
+        if (this._isVideoFile(file)) {
+          // show mp4 file in modal with html5 player
+          this.previewVideoFile(file);
+        } else if (this._isFilestackUrl(file.url) && this._isFilestackPreviewSupported(file)) {
+          // show filestack document viewer
           this.previewFile(file);
         } else {
           // non-filestack files: open in new tab as download fallback
-          this.notification.presentToast('Preview not available. Opening file in a new tab.');
           window.open(file.url, '_blank');
         }
         break;
@@ -322,6 +328,56 @@ export class TopicComponent implements OnInit, OnChanges, AfterViewChecked, OnDe
     return url?.includes('filestackcontent') || false;
   }
 
+  /**
+   * @description checks if file is an mp4 video (html5 browser-supported format)
+   */
+  private _isVideoFile(file: { url: string; name: string }): boolean {
+    const urlLower = (file.url || '').toLowerCase();
+    const nameLower = (file.name || '').toLowerCase();
+    return urlLower.endsWith('.mp4') || nameLower.endsWith('.mp4');
+  }
+
+  /**
+   * @description checks if a file type is supported by filestack document viewer.
+   * supported: pdf, ppt/pptx, xls/xlsx, doc/docx, odt, odp, images, html, txt, ai, psd.
+   * unsupported: audio files (videos handled separately by html5 player).
+   */
+  private _isFilestackPreviewSupported(file: { url: string; name: string }): boolean {
+    const unsupportedExtensions = ['.mp3', '.wav', '.ogg', '.aac', '.flac', '.wma', '.m4a'];
+    const urlLower = (file.url || '').toLowerCase();
+    const nameLower = (file.name || '').toLowerCase();
+    return !unsupportedExtensions.some(ext => urlLower.endsWith(ext) || nameLower.endsWith(ext));
+  }
+
+  /**
+   * @description preview mp4 file in modal with html5 video player
+   */
+  async previewVideoFile(file: { url: string; name: string }): Promise<void> {
+    const modal = await this.modalController.create({
+      component: FilePopupComponent,
+      componentProps: {
+        file: {
+          url: file.url,
+          name: file.name,
+          type: 'video/mp4',
+        },
+      },
+    });
+    return await modal.present();
+  }
+
+  /**
+   * @description returns action button icons for file attachment based on preview support.
+   * preview icon shown for:
+   * - mp4 video files (shown in html5 video modal)
+   * - filestack urls with document viewer supported file types
+   */
+  getFileActionIcons(file: { url: string; name: string }): string[] {
+    const canPreview = this._isVideoFile(file) ||
+                      (this._isFilestackUrl(file.url) && this._isFilestackPreviewSupported(file));
+    return canPreview ? ['download', 'search'] : ['download'];
+  }
+
   async actionBarContinue(topic): Promise<void> {
     if (this.continueAction$) {
       this.continueAction$.next(topic);