You can now delete old responses in Interactive Questions and reuse the same video! Be sure that all responses are recorded in a grade book as these grades cannot be recovered! To delete old responses, you can do the following:
1. Navigate to the Video Management page for the video you wish to reuse.
2. Click on 'Edit Questions' on the right side panel
3. Click on 'Responses' in the upper left hand corner
4. Click 'Clear Responses' in the right corner
5. Click 'Delete'
Here is a quick walkthrough: