So when you submit your revision, you will:
1. Go to the tutorial and click ACTIONS
2. Click DELETE to remove the old video.
3. That ACTIONS tab will now turn to INSERT.
4. Click on the INSERT tab and insert your new vide.
5. Check Overview and make sure timestamps line up with new video.
6. Click Submit
7. Mark "S" on Progress Tracking and 2 in the S# column which denotes the number of times you have revised/submitted this particular tutorial.