Quote:
Originally Posted by sayornis
A lot of the time, epubs I upload get rejected because they are epub v3 and the send to kindle feature only accepts epub v2 or lower. Calibre usually converts to epub v2 which is why conversion is an easy fix.
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Maybe a silly noob question, but how can we know it's an ePub 3?
edit : I mean, there's no simple way like a different name, icon, or getting info (command I on Mac).