I'm putting the .azw3 files in <internal storage>/Books. When I do that, they show as expected in the listing of my books in the main Kindle Books interface, just like a book I've downloaded from Amazon directly. But I can't actually see where Amazon puts books it downloads. If I use the file explorer app to navigate to the folder and open the .azw3 file, it doesn't know what to do with it. But if I do the same with a .mobi file, it opens the Kindle reading app. Note that when I use Calibre to sideload an azw3, it puts it in the same folder.
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