As I understand it the problems are with Kindle Unlimited files, and it's more complicated if you don't actually own a Kindle (like, you have to use the Kindle app, but only some app versions work?). I don't have KU, and I import the files directly into Calibre from my Kindle and it all Just Works. Or it did last time I ripped a batch a month or two ago. Maybe something's changed in the meantime and I'm due for some frustration the next time I try. I dunno.
Thanks. I'll try that. I have a Kindle, but in the past I downloaded the books to the PC when I wanted a backup, and used Calibre on that. I did this because the docu said that it could only un-DRM books in "PC" format, the Kindle used something different. This is from a few years ago.
