Thanks. Final question: I see that Calibre on my PC shows the updated number of books (bottom left corner, e.g., [2617 books, 1 selected], and I cannot find any metadata.db file on my PC. So what is Calibre accessing (presumably on Amazon Cloud?) to get the updated info?
If I understand correctly, it looks like everything is up to date in my Amazon Cloud folder except for the metadata.db file, but if I was to use a 3rd party sync program, what would it sync since there is no corresponding metadata.db file on the PC?
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