Can't transfer iMovie project to external drive
Hi there - I'm currently running iMovie '11 on MacOS Sierra 10.12.5 (outdated, I know) and trying to run/store an iMovie project on a USB. I've read that the way to do this is to open iMovie, set the Events Library to "Group Events by Disk," then command-click and drag the project over.
However, my external drive appears in the Events Library with a small yellow error sign, and won't let me drag the project over:
Anyone know what the problem is? The USB has over 20GB of space left (far larger than the project itself, so that shouldn't be the problem) and I believe it should be a USB 3.0.
MacBook Air 13″, macOS 10.12