Attach and drag and drop both worked for me just now. I'm in 15.1, but it should be the same. I was attaching and dragging from Photos -- is that what you did?
The first things to try are these:
- Restart the computer (of course)
- Re-start in Safe Mode. This bypasses certain potentially disruptive processes. Safe Mode is different for different computers, so see this:
Start up your Mac in safe mode - Apple Support
Those are the most important things to try first. Then try these:
- Use another library if you have one, or make a small test Library with a few pictures in it and see if the same thing happens. You can create a new Library by closing Photos and then option-clicking on the Photos icon. To use the "Attach" function, you would have to designate this new Library as the System Library in Settings>General. Don't turn on iCloud for this Library.
- Make a new user and see if the same problem recurs with it
- Rebuild your Photos Library--close Photos and re-launch by option-command-clicking the app icon.
The idea is to find out if the problem is with the Library, with your account, or with caches and login items, and stuff like that. One of these steps may fix the problem, but their failure to work also helps figure out what's happening.