If you take your epub and change the extension to .txt, you can use Send-to-Kindle and Amazon will convert it into an azw3 for you with WhisperSync functionality. (I was using KindleGen to convert my epubs before I learned this trick.)
Example: bookname.epub > bookname.txt
I usually use the Send-to-Kindle app because then you can input the title and author. If you email it to your Kindle, the title will be the filename and the author will be your email address.
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