A small addition to my last post: Sometimes, it is necessary to flip a few pages for the cover lockscreen to work. Also, I found one book that still doesn't work even after using azw3. Maybe something went wrong when sending it to the kindle. All other books that work correctly start on the book's first page, but this "defective" book has the cover as the first page when opened on the kindle. Let's hope amazon simplifies this in the future (I know, I know, why would they, but hey, don't lose hope).
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