"Missing Remote Media"
I m in iMovie and have been dragging and dropping photos from my Photos App directly into my Timeline for my project. It seems to be fine but when I quit and come back in many of the photos show "Missing Remote Media". What does that tell me? MUST I import the photos into iMovie then drag them down into the timeline? Are there any photo formats that cannot be used: HEIC,.... I can't get the Ken Burns effect to work on some of the photos and I have tried some of the suggestions from the message board (eg. open iMovie while holding the Option and Command keys). Please help.
iMac 27″ 5K, macOS 13.6