Thanks for your suggestions that "Do not put your calibre library on a networked drive". I shall clarify that my calibre library is on local drive, the folder located in NAS is just connected as a device, similar to kindle. I send current reading books to this nas folder, but the library folder which contains metadaba.db is not on NAS. I thought it's different from what you advise not to.
Back to copy books back to the calibre library, I don't know how things're going on Android, as for IOS, the book in CC is just the same as that import from calibre, and the modified book files are not stored in CC. So I'm confused how to copy the modified book (not in CC) to calibre using CC's ability.
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