Update file-sharing-tutorial-acs-chat.md

Author: jpeng-ms

articles/communication-services/tutorials/file-sharing-tutorial-acs-chat.md

@@ -296,7 +296,7 @@ const attachmentSelectionHandler: AttachmentSelectionHandler = async (uploadTask
 
 ## File downloads - advanced usage
 
-By default, the file `url` provided through `notifyUploadCompleted` method is used to trigger a file download. However, if you need to handle a download in a different way, you can provide a custom handler `actionsForAttachment` to ChatComposite. 
+By default, the UI library will open a new tab pointing to the URL you have set when you `notifyUploadComplete`. Alternatively, you can have a custom logic to handle attachment downloads via `actionsForAttachment`. Let's take a look of an example.
 
 `App.tsx`