[pssquirrel]

I'm trying to understand how Kindles handle book covers.

I've found that when I drag-and-drop an AZW3 directly from my computer to Kindle, I get a generic cover on the Kindle homescreen when browsing in cover view. But when I use Calibre to transfer the AZW3 to my Kindle, the appropriate cover appears on the homescreen.

I also understand that page numbers are stored in a totally separate file (apnx).

Is the cover also stored in the apnx file? or another external file? What does Calibre do when it transfers the AZW3 that is different from a straight drag-and-drop?

I am mystified as I've never had this issue with epubs. Thanks for any insights!