iMovie - clips and photos cannot be dragged into timeline
iMovie Version 10.3.5
Monterey 12.4
Macmini M1 2020
Update iMovie, restarted Mac, started new project, etc. etc...
iMovie - clips and photos cannot be dragged into timeline (even into empty timeline, new project); occasional (not consistent) error message: "... you are combining audio and video clips outside the primary storyline ..." ; same clips and photos can be dragged into timeline on iOS iMovie.
Several users have been reporting this issue.
What is the resolution?
Thank you.
Mac mini 2018 or later