You can add comments directly to a video or audio file to create commentary or ask questions. You can edit or delete your comments if necessary.
You can also reply to a comment that has been posted in the timeline. Currently, replies only support one reply level. You cannot reply to another user's reply.
Note: Users with editing rights can delete any comment at any time.
In your Arc account, locate the media you want to view. You can view specific media in the My Uploads menu , or search for the media in the search field .
The timeline includes the total length of the video or audio file .
To play the video or audio file, click the Play button .
As the media plays, the bar acts as a timer for the media. Starting with 00:00, the numbers change to show the elapsed time in the media .
To pause the video or audio file at any time, click the Pause button .
To view any inline captions as you watch the media, click the Comments icon. When enabled, the dots in the timeline show any comments in the media , which can be viewed directly in the Comments tab . Comments are arranged chronologically by time and are highlighted as they appear in the timeline.
To create a comment in the timeline, enter your comment in the comment field .
When you start typing in the Comment field, the video or audio file will pause automatically. The Comment button  displays the time that your comment will appear in the video or audio file.
Create Comment Reply
If you just want to leave a reply to an existing comments, locate the comment and click the Reply link.
To delete your comment, click the Delete icon , then click the confirm delete link .
Note: Deleting your comment retains your name and shows that the comment has been deleted. Deleted comments cannot be recovered.