Quote:
Originally Posted by shamanNS
It seems that Kindle for Android allows "last page read" sync only for book that are associated with your Amazon account ( bought book or archived personal documents).
1) Books with valid ASIN (like deDRM retail book from a friend) that are not on your Amazon account = disabled sync option in Kindle for Android.
2) Converting any book from any format to mobi/azw3 and editing EXTH 113 and EXTH 504 (adding ASIN from one of your Amazon bought books) = sync option is enabled. (and wrong cover art displayed in Kindle app as side effect).
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And why would manually adding in the ASIN work when using the official copy doesn't? It's the same ASIN==>same field either way??
Note that if you do a mobi-to-mobi (or azw3) conversion, calibre replaces the ASIN with its own UUID, that may be what's happening for you?
calibre will not change the ASIN if you import it, but conversion creates a whole new book, without the ASIN. Kovid did this deliberately, so the book would still be unique.