This is something I've never used in over 20 versions of MC, but checking it is currently in the "Update Database . . . ." and all the files play fine within MC at the moment. MC seems to know correctly where they are and what they are called. The reason I'm doing this is because I needed to export them to a NVMe drive for a car, that handles music tagging like Musicmatch did back in the 90's. I transcoding to a device in MC to make sure the tagging is how I need it.
Only when I attempt to rename the file (so my files somewhat match my tags), based on the rules I've used for years, does it not actually do it, no error, but updates the DB and hence then doesn't play, until I revert the change so the DB matches the path/filename. It's as if the file is read only, but as the same user I can change it using File explorer, and the file doesn't indicate RO attributes.
Maybe I'm missing something basic, My MC has just worked with my library for literally a couple of decades. It's upgraded over years from about MC11.
Help for that page does not explain the various modes at the top of the Rename, Move, Copy window.
Full disclosure, this is a copy of the directory with all the media, and a restore of a backup library file from a MC29 instance.
Never had issues before moving machines and having a new MC "take over" a previous version library folder.
Apologies if I'm missing something about this mode, checked the forum and the wiki and it seems to be similar operations when I moved my library between hardware and the storage drive/path changed, that was an easy update and MC was back in sync.
[Edit] I also tried removing a couple of albums and re importing them again.
I'm beginning to think I need to wipe this Windows 11 install (pre installed on a NUC) and start a fresh with my own, even though this has barely anything installed to date and almost totally un customized.