Quote:
Originally Posted by stumped
but you still cant sideload epub via USB with device connected to PC- strange
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Why? No eink Kindle ever supported epub and it would need FW updates for every Kindle, but Amazon KDP has had epub as recommended upload for years rather than docx and then they make all the different Kindle formats from it.
Trivial to convert epub to azw3 on Calibre and use USB to avoid Amazon's dubious "Send to Kindle" service.