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Book cover issue.
Anyone got this problem? I have some sideloaded books which I use Calibre to transfer to Kindle, anh I encountered some problems lately.
Question 1: All of them have covers in calibre. But when check in Kindle library, some of them are missing cover. I did try to transfer while turning wifi off and plug-replug for Calibre to sync to cover, but it doesn't work for some books and I don't know why.
Question 2: Despite having covers shown in the library, some of the book covers doesn't show up on lockscreen even though I turned on the display book cover feature, while some works perfectly fine. Their format is azw3.
What should I do to fix this? Thanks for helping.
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