Can't get Plex to load my music files

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I’ve been using Plex for years and really like it, but something happened and it no longer can find my music files. I’ve tried everything for a week now and it just won’t work. I’ve downloaded the plex server, and plex. I have valid password and PIN. I’m using Windows 11. I’ve signed up for Plex Media server and that doesn’t work. Please help. I don’t want to have to go back to Media Monkey.

How so?
Can you no longer access a previously existing library or is the library just empty?
Did you change anything about how the media is stored on your setup, e.g. a change of drive letters?

Not sure what you mean by “I’ve signed up for Plex Media server”?!