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Thank you for your suggestions. Not getting anywhere on my Mac mini M1, I decided to download and install the same edition of calibre 6.9.0 on older Mac my wife has. It is running Catalina, not Ventura as is the mini. When I opened the Kindle drive it showed its folders, rather than the totally empty view on my M1. All the books I'd sent to the Kindle were there, but at the root level. I simply dragged them into the documents folder and everything is now good. So, eventually it has something to do with the Mac mini M1 and its Apple Chip. Hopefully there will be a work around, as many people won't have a second older machine to use with calibre.
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