u/lordoftherings87

I download EPUBs, convert them to KFX format, and transfer them to my Kindle. Some of these EPUBs show the cover correctly in Calibre, but after transferring to the Kindle, the cover disappears on the device even though it still shows in Calibre.

I also tried downloading different cover images from the internet and updating them manually, but I’m getting the same result.

Can anyone guide me through this? Is the issue with the EPUB file itself, or am I missing something during the conversion/transfer process?