Follow these instructions if you run out of space on your mobile device.
First go to your Photos Gallery, and click on the file folder that is named Midwest Streams.
Once you find and click the folder, you will be shown all of the videos you have taken through the app.
Select all previously uploaded videos, either by pressing Select and then clicking them individually, or by hitting "Select All"
Once all the videos have been selected, delete them by pressing the trash can in the bottom right corner of the page.
Apple stores recently deleted files so that they can be restored later just in case.
To delete these files permanently:
Navigate to Settings > General > Storage
Your device will recommend to empty the "Recently Deleted" album as long as it stores more than one video, hit "Empty" and agree