Ok, so after some testing I think I definitely need to reinstall Dorico 2 on my laptop as I managed to attach the video without issue on my desktop machine:
The exact same video file gave me the result I described before on the laptop Dorico installation. I’ll report back on how this goes.
Ok reinstalling didn’t seem to solve the issue, but then I didn’t trash my preferences or anything like that either… my previous files still showed up in the hub for instance. I’m wondering if I have to hose my system completely of the program before it’ll work.