Making an .azw3 file available
Thanks to Calibre, I created decent-looking .mobi and .azw3 files from an InDesign-based .epub file. (Calibre delivered the goods, whereas both Kindlegen and the InDesign plug-in did not.) I downloaded the .mobi file to Amazon, and the book is now in the Kindle store, but only (so far as I can tell) in the .mobi format. KDP won't upload the .azw3 (KF8) file. So how can I make that available in the Kindle store?