Quote:
Originally Posted by kovidgoyal
This has nothing to do with kindlegen or ebook-convert amazon chose to not display the in-book cover on its kindles for files that have an ASIN not present on its servers. ebook-convert adds an ASIN kindlegen does not. Without the ASIN cross device syncing does not work. When you send the book via calibre calibre pregenerates the cover thumbnail to work around this Amazon policy.
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Is there a way to access just the functionality in Calibre that pregenerates the cover thumbnail without going through the entire mobi to mobi conversion and save to disk process?