I have Calibre 2.84 on Win 10, and had a problem with books not being accessible on my Kindle Voyage. I just got off the phone with the Kindle help desk and it seems that when you transfer books via the USB they should go to the \documents folder, not in any of the documents\{Author Name} subfolders I need to let the Calibre team of this to be sure Calibre is sending files to the right place.
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