[lamont]

Alright, this stuff is way above my understanding.

I generally download my e-books as azw3 files from my Amazon content page to my computer. I then connect my Kindle with USB to the computer and drag the azw3 files into the document folder. This has worked in the past.

I have used the same method to sucessfully add some PDF files.

Now Amazon seems to interfere. They change my azw3 files on the Kindle to kfx. I don't like that. That's my first problem.

Furthermore, I would like to edit many of the book file titles, which I have done in Calibre by editing the metadata.

If I drag the folder that contains the azw3, the cover jpg and the edited metadata file into the document folder on the Kindle, it shows up in the Kindle Document folder, but once the Kindle is disconnected, the book is not listed.

Somewhere along the way I am now doing something wrong, but I can't find out what it is.

By the way, I do keep my Kindle in Airplane Mode, but when I use a USB connection to my computer it connects to Amazon anyway. I really don't want to have to unplug my ethernet each time I plug in my Kindle.