Cannot drop images or videos onto iMovie timeline
Suddenly I cannot drop images or videos onto the iMovie timeline. They simply won't attach to the timeline so I cannot make a movie. I have no idea why this is suddenly happening. I have been making iMovies for years. All images and movies are from my iPhone.
I have a MacBook 16" with OS 12.6.
iMovie is 10.3.4
I have 1.5 TB remaining of my 2 TB iCloud account.
I resorted to using iMovie on the iPhone today .. with success, but very basic.
Any ideas? Thank you.
MacBook, macOS 10.15