If after updating to iOS 14 you're experiencing an issue consisting in the app freezing and crashing when you add a snippet, you must know we're able to reproduce this issue and we're working on a fix.
Please check if you're recording videos in 4K on your phone's camera settings. If that's the case, please start recording in 1080p. At the moment, there's an issue in the app that makes it buggy to add this kind of video, so for now, you need to record the videos in 1080p to be able to add them to 1SE.
We're really sorry for the inconvenience!