This bundle is intended to be a kind of universal file, which can be understood both by older Kindles (who only know MOBI) and the newer ones (who know MOBI and AZW3). Using "Both" bundles two copies of the book together, one in MOBI format and the other one in the newer AZW3 format. I don't know what is the difference between the types, but I am happy with the old one. Note that my ebooks are created with Calibre converting from epub, and emailed using Calibre. Whichever format it gets uploaded as, sync across devices works. If it is sent as a dual mobi and comes down as a kf8 (azw3) file, I have no cover. If I have a book that is emailed to Amazon as a regular. So for eink Kindles, unfortunately, you have to choose between Whispersync and covers.
(iOS and Android apps seem to use the cover image inside the ebook so don't have this problem.) As a result, eink Kindles are not able to download the cover and you get a generic cover. The problem with Send-to-Kindle is that when you send an ebook via Send-to-Kindle, Amazon creates a new ASIN for it and overwrites whatever ASIN you may have embedded yourself. This is roughly how it worked then (don't know if there have been any changes since):Į-ink Kindles get covers by downloading the image directly from Amazon's server based on the ASIN number embedded in the ebook. The last time I delved into this (a few years ago), the answer was no. So for eink Kindles, if you prefer AZW3 format (as I do), you have to choose between Whispersync and covers. (I don't know about Android, but iOS uses yet another format, AZK, which appears to use the cover image inside the ebook so don't have this problem.) As a result, eink Kindles that receive the AZW3 are not able to download the cover and you get a generic cover. The problem with Send-to-Kindle is that when you send a dual-mobi (containing both AZW3/KF8 and old mobi formats), Amazon creates a new ASIN for the AZW3 and overwrites whatever ASIN you may have embedded yourself. Make sure you have WiFi on when you sideload the book and your Kindle will download the cover based on the embedded ASIN.
You can also use the KindleGen plugin for Sigil to do this by checking the "Add Fake ASIN" box. If you include the ASIN in the opf ( urn:mobi-asin:B000000000 or urn:amazon:B000000000 ), you can use Calibre's Quality Check plugin to embed the ASIN ("Fix ASIN for Kindle Fire" command). If you use Calibre to sideload via USB, Calibre will copy the image to the Kindle for you.
This is roughly how it worked then (don't know if there have been any changes since):Į-ink Kindles get AZW3 covers by downloading the image directly from Amazon's server based on the ASIN number embedded in the ebook. The last time I delved into this (a few years ago), the answer was no, as far as AZW3 goes. Is there a way having both Whyspersync and book covers on my Kindle with my old epub books?
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