Photos keeps saying "Updating Library" and getting stuck
I am on a Mac running Sequoia 15.2 and using a G Drive (3 TB capacity). I've opened these libraries before but now they just keep getting stuck updating.
iMac 24″, macOS 15.2
Question marked as
How is your SSD drive formatted? To avoid damaging the Photos Library an external drive must be formatted in either APFS format or Mac OS Extended (Journaled) format. Additionally, the drive can not have had Time Machine on it since it was formatted. There have been so many problems with using incompatible drives that the newest macOSs won't even allow a Library on a non-Mac formatted drive to open, since there is a chance of damaging the Photos database. See this:
Move your Photos library to save space on your Mac - Apple Support
If this drive is in a an incompatible format, stop running Photos with it immediately! A Photos Library can sit on an incompatible drive, but running it may corrupt the database.