Export 4k 60fps in iMovie on MacOS
How can I export 4k 60fps from iMovie on MacOS? I can't seem to find a way, but I see that iOS allows it? Can I transfer iMovie project from MacOS to iOS? If no to everything, why would the iOS iMovie app be more capable than the original MacOS vesrion..? I need any kind of workaround as all my content are 4k 60fps videos and I've already completed the editing within iMovie.
iMac 2017 on MacOS 12.2.1
iMovie on 10.3.1