Sending in Messages stalls after sending pictures from Photos
When I use the share function in Photos to send an iMessage, the progress bar creeps slowly to about 90 percent before coming to a finite halt. I see the same behaviour when copying a photo from Photos and pasting it in Messages.
I don't see this behaviour when I export a picture from Photos and then pasting it in Messages.
The only remedy I have is to delete the picture from Messages and kill the processes, and start up Messages again.
These problems started with macOS Mojave.
MacBook Pro 15", 10.14