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When a book has a question mark instead of cover it does mean, that the book has not extracted cover properly from the file, so it tries to extract it every time you open the book. Does it mean, the book has no cover at all?
What do you mean by 'When I send the book from another app again'?
You can have one book named a.epub, b.epub, c.epub and even it is one book from human perspective, it is three different files, three different books in the app.
So if you import the same book and it is located on a different place in the library, it is a different book/file.
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