I'm having this problem: (Apple Photo's Library from Mojave to Monterey looks stuck on updating).
I came across this (Photos: "Updating Library..." is stuck, library seems bricked) and it exactly sounds like my problem. The only thing is: I don't know how to use Disk Utility.
The external harddrive I use, is used in a network. I use it to store Apple as well as Windows files. From every device I can access this drive (by login). Can I use Disk Utility to repair my Photos Library-file on my external harddrive?