Can't see any folders or files when trying to import from external HD
I am using iMovie 10.1.14. I have lots of media on a couple external hard drives that I want to import. I click the import button and the normal interface appears. All my devices show up in the left nav and I can navigate to media on my internal HD. But when I click on any external drive, the main window, where you can normally navigate through folders, is blank.
iMac Pro