File will not export Final Cut Pro on IPad Pro

I have created a video (60 GB) using standard video/audio and text effects on iPad Pro. I am trying to export the file. It fails at 90% after about 10 minutes.

ERROR is: Export Failed. Export Failed.

NOTE: I have enough storage on my iPad. 256 GB free.

NOTE: (i am also trying to export to Mac as a FCP project but when i import, it only imports media, there is no timeline/project). I'm not sure if it's related.

NOTE: Open to other ways to save files, as urgent to complete video.