There's a file, I believe it's called something along the lines of metadata.calibre, that's kept on your device and Calibre uses it to keep track of books on device and their corresponding books in library. If it got deleted or damaged Calibre loses track of the previous matches.
It's possible to re-match them without resending to device. Go to device view and it'll be in the book context menu there. I'm afraid there's no real way to automate this that I'm aware of though.
Last edited by ownedbycats; 10-31-2024 at 12:26 PM.
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