Quote:
Originally Posted by DeplorableBook
When I tried to click "Add Metada" button, it said that it was not yet avail for epub3 ...
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Then you're using a terribly outdated version of Sigil. The ability to edit epub3 metadata with the metadata editor has been around for a long time. Update your Sigil.
https://www.mobileread.com/forums/sh...d.php?t=210791