In the MDE that Download ADDS the cover just to Calibre. The one right above the button.
Not the book For that, you need to use something like Polish, Modify EPUB, Embed or manually Edit the book and updat that way..
When you send, the current cover (you saw in the MDE), is normally embedded. BUT
Some devices do not get covers from the book. Those use their own methodology and depend on specific metadata to ID the edition
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