Quote:
Originally Posted by jhowell
Calibre creates and loads a separate cover thumbnail file. The Kindle will use this thumbnail for sideloaded KF8/AZW3 format files marked internally as a book (cdetype=EBOK).
MOBI7 files do not have this problem because the Kindle firmware is able to extract a cover thumbnail from them. Kindle does not support this capability for AZW3 files.
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Yesterday a publisher sent me a PDF file for a book I intend to review. I used Calibre to convert it to AZW3 and emailed it to my Fire tablet. It was rejected and I was told to use a mobi. So I did, and it came through just fine (with the usual concessions that a PDF conversion is not going to be perfect).
I remembered that I had been in the habit of using mobi for Send-to-Kindle, but had forgotten why.