I had an 11GB movie in Apple Photos (sync'd from my iPhone) and I wanted to upload it to YouTube (actually via AirDrop to another laptop first).
The "export" options in Apple Photos provided no visual indicator of what they were doing - as far as I could tell they were broken.
I wanted to deal with the actual file on disk. I figured out how to get access to that like so:
- Right click on the movie in Apple Photes
- Select Edit With -> QuickTime Player
- In QuickTime Player, command-click on the filename in the QuickTime window to get a list of folders
- Click on the parent folder of the file to get a Finder window
Now you can treat the .MOV like a regular file! Right click and AirDrop and suchlike should work fine.
The command-click menu in QuickTime should look like this:
Then when I went to quit the Apple Photos app later it told me I had export jobs in progress, the jobs that I hadn't been able to see in the first place!