Thread: Why can't I upload an epub3 book to my Kobo Forma?
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Old 03-24-2020, 06:53 PM   #7
theducks
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Quote:
Originally Posted by hobnail View Post
When you download an epub3 from Standard Ebooks the file extension on it is .epub3 so you need to delete that 3 so that it's .epub. You may need to tweak your Windows settings so that it shows you the file extensions (always a good idea in my opinion).

I don't know what the epub standard says but it wouldn't surprise me if the extension is supposed to be epub and not epub3.
It is the Internals of the book that says it is version3
This does pose a problem if the user has devices that do not support EPUB3, because you can only have 1 EPUB (filetype) file per book entry
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