I'm still using Final Cut Express
If you are talking about “The Video Converter” by “Float Tech, LLC” https://apps.apple.com/app/the-video-converter/id1082682593 that is one of the worst apps to convert videos with. It says that “Files are uploaded” and you have to pay to convert to mp4. I would call “The Video Converter” by “Float Tech, LLC” a scam.I logged back on to advise the problem is solved! I used Video converter by Float Tech from Apple App Store.