How can I re-edit a finalized movie in iMovie?
I made and finalized a 5 minute video last year, and want to update it. I need to take out a short clip and remove an annotation. I tried re-importing it as an mp4 (from youtube, the only place I could find it) and creating a new project, but it won't let me edit anything.
Is it possible? What am I doing wrong? TIA
MacBook Pro with Retina display, iOS 10.1.1