I’m admittedly a little fuzzy on this, but aren’t ebooks dragged from Books not the actual epub, but rather some sort of package that happens to have the exact filename as the epub?
Edit: Yes, just confirmed that an "epub" dragged from Books to Desktop is a package that you can navigate into using Terminal, and what's inside is essentially already an unzipped epub. So likely the application doesn't know what to do with it, since it's not an actual zipped epub.
Last edited by phillipgessert; 01-16-2023 at 12:07 PM.
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