imovie will not export and is on the struggle bus it just quits
Hello, I am doing video lessons for elementary students on zoom and importing them to imovie to edit and then post on google classroom. I have had trouble with exporting so yesterday I tried a few things. First I deleted imovie from my computer. Then, I downloaded catalina, and finally I downloaded imovie. Well, I made a 16 minute video and it imported fine to imovie and I was able to edit it. It would not export though, only a few seconds would export. I have 52.85 GB available of 121.GB. I am afraid I may have deleted an application or something that is needed for exporting videos. I keep getting the error 50 occurred when exporting to movie file on computer. I tried using different version of lesser quality and that still only got a few seconds downloaded of a 16 minute video. I do have an older mac air, 2013 but I did check and it was approved for the catalina download and I did delete a bunch of stuff to make room for it too. I also purchased a san disc to download my imovies too but Imovie does not give me a choice for that for downloading. My imovie seems all wonkie too, I cannot find download to theater or even find theater now. SOS please.
Help please my students need support!
MacBook Air 13", macOS 10.15