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 14a66447f..b4bcfa9ec 100644
--- a/projects/v3/src/app/components/topic/topic.component.spec.ts
+++ b/projects/v3/src/app/components/topic/topic.component.spec.ts
@@ -151,14 +151,30 @@ describe('TopicComponent', () => {
 
   describe('actionBtnClick', () => {
     it('should call downloadFile when index 0', () => {
-      component.actionBtnClick({} as any, 0);
+      component.actionBtnClick({ url: 'https://example.com/file.pdf' } as any, 0);
       expect(utilsSpy.downloadFile).toHaveBeenCalled();
     });
 
-    it('should call previewFile when index 1', () => {
+    it('should call previewFile when index 1 and url is filestack', () => {
       spyOn(component, 'previewFile');
-      component.actionBtnClick({} as any, 1);
-      expect(component.previewFile).toHaveBeenCalled();
+      const file = { url: 'https://cdn.filestackcontent.com/abc123', name: 'doc.pdf' };
+      component.actionBtnClick(file, 1);
+      expect(component.previewFile).toHaveBeenCalledWith(file);
+    });
+
+    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' };
+      component.actionBtnClick(file, 1);
+      expect(window.open).toHaveBeenCalledWith(file.url, '_blank');
+      expect(notificationSpy.presentToast).toHaveBeenCalled();
+    });
+
+    it('should open new tab for non-filestack url even without extension', () => {
+      spyOn(window, 'open');
+      const file = { url: 'https://storage.example.com/files/12345', name: 'report' };
+      component.actionBtnClick(file, 1);
+      expect(window.open).toHaveBeenCalledWith(file.url, '_blank');
     });
   });
 });
diff --git a/projects/v3/src/app/components/topic/topic.component.ts b/projects/v3/src/app/components/topic/topic.component.ts
index 1311f72ca..343b10ade 100644
--- a/projects/v3/src/app/components/topic/topic.component.ts
+++ b/projects/v3/src/app/components/topic/topic.component.ts
@@ -304,11 +304,24 @@ export class TopicComponent implements OnInit, OnChanges, AfterViewChecked, OnDe
         this.utils.downloadFile(file.url);
         break;
       case 1:
-        this.previewFile(file);
+        if (this._isFilestackUrl(file.url)) {
+          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;
     }
   }
 
+  /**
+   * @description checks if a url is a filestack cdn url
+   */
+  private _isFilestackUrl(url: string): boolean {
+    return url?.includes('filestackcontent') || false;
+  }
+
   async actionBarContinue(topic): Promise<void> {
     if (this.continueAction$) {
       this.continueAction$.next(topic);