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Let me update myself after some test:
All the books I sideloaded using calibre.
Around 85% book covers are working with books in mobi format.
Most of them which is not working were manually added covers by myself.
None of the book covers are working with books in azw3 format.
I have converted the azw3 books to mobi, and the covers are still not working.
So there must be some rules to work, about resolution, or format, jpg bmp gif png or whatever?
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