[Spinningwoman]

I’ve used Calibre for years - never done anything clever with it, just kept my library on Dropbox so that I can easily download books to my phone and e-readers when I want them. I’ve never really needed to understand how the library works. Now I’ve got the odd effect that I added books, which showed quite normally on the Calibre screen and were correctly written to folders on Dropbox in the normal way. But on next entering Calibre, they aren’t in the library. They are still there on Dropbox but Calibre doesn’t seem to know about them. Presumably the library list is wrong somehow? How do I fix it?? Thanks. Great program by the way - I wish I could add audiobooks to the listings too.