The information in the link is incomplete; I have read it many times in my struggle. If this sounds trivial, my sincere OCD has driven me to figure this out through trial and error.
Converting from any format to azw3 will get: books filed under "books" and a thumbnail cover so long as the cover is of a high enough resolution to meet the device requirements (most Calibre generated covers seem to be).
However, enabling the social media sharing during the conversion removes the thumbnail view (oddly this is the inverse of what occurs with a mobi conversion??).
It's a Calibre conversion issue... it's a Kindle issue... I brought up the matter here because having recently jailbroken the device, I wanted to dig deeper into fine tuning the way the Kindle sorts these things. When I download from my COPS server (all azw3), I get mixed results. I have used ExtractCoverTumbs.py in the past to fix this at the desktop level. Could there maybe be a way to trigger the script on the device when for instance, a file is downloaded from a server and no thumbnail is supplied either by USB or the Amazon servers?
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