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Old 08-09-2015, 06:02 AM   #2
eschwartz
Ex-Helpdesk Junkie
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Posts: 19,421
Karma: 85400180
Join Date: Nov 2012
Location: The Beaten Path, USA, Roundworld, This Side of Infinity
Device: Kindle Touch fw5.3.7 (Wifi only)
I believe you will find it is sufficient to send the book using calibre.

There are two ways the Kindle gets covers:
  • If the book is a PDOC (has that ugly "Personal" banner) it will be extracted from the ebook file.
  • If the book is Just A Book, it attempts to download the cover from Amazon's servers, using the exth 113 meta field (ASIN, a/k/a Amazon product ID). Stupidly, won't even try falling back on the embedded cover.

calibre works around this problem of non-PDOC ebooks, by sideloading the cover thumbnail itself, into the
Code:
[userstore]/system/thumbnails
directory where thumbnails are kept by the Kindle.



I've never seen missing thumbnails when sideloading via calibre, but I see them all the time when sideloading via the File Browser.
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