Thread: Embedding metadata into epub files
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Old 06-15-2021, 03:22 PM   #6
DNSB
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Quote:
Originally Posted by steve1977 View Post
When using the plugin on an ebook, I get the message "calibre, version 5.21.0
ERROR: Cannot polish: Polishing is only supported for books in the AZW3 or EPUB formats. Convert to one of those formats before polishing".
I would say that the error message is pretty self-explanatory. If your ebooks are not in EPUB or AZW3 format, convert them to one of those two formats before polishing.

If you think the file is already in epub for example, you might want to try opening it in calibre's editor and error checking it. I'd recommend installing the epubcheck plugin for the editor and use it instead of the builtin error check. Another choice might be to do an epub to epub conversion which will often clear up many errors.
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