How do I delete media in an Arc account?
If necessary, you can delete a video or audio file from Arc.
Deleting a video or audio file also removes all comments.
Note: If you delete media from a course collection, the media will only be deleted from the course where you are deleting the media. The media will still exist in all other collections where the media exists.
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 .
Hover over the media and click the media thumbnail.
Click the Delete icon.
Click the Confirm Delete link.