Quote:
Originally Posted by Adoby
If you change metadata in the GUI it is not written to the epub file, but only stored in the database.
If you use any of the functions to send or save the epub outside the calibre library, then the metadata is written to the epub file. The same if you do any conversion or polish on the epub.
This behavior is intentional. It means that calibre can be used to store the original epub without ever modifying it. But when you send the epub to device, save it to disk or convert to other formats, then the copy is updated. Also it makes it faster to update metadata.
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But you do not want to have Calibre always updating the metadata when you send or save the eBook because it does a conversion and does mess with some of your code and that means when there is no metadata update, you still get the conversion. Check in the options to turn off this metadata update on a save or send so this won't happen. Use polish as then you can update only the eBooks you want updated and not all of them.