For the friend of mine who has been downloading them to use with Send to Kindle, he just adds them to calibre and either converts to azw3 to sideload to their Kindle or sends to Amazon for them to convert and then sync to the Kindle. Amazon does not know or care about the .kindle.epub file extension. For the most part, their opinion has become that calibre does a better job of conversion than Amazon though they lose the ability to sync between their Kindle and their Kindle as they phrase it. Basically, one device makes the ability to sync reading progress a bit useless.
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