I ordered 2 new Kindles (compact 6 inch 300 ppi 2022 with advertising). I can no longer upload books via Calibre. I can convert the books, but the button doesn't appear that allows me to put the books into the Kindle. For information: I have Calibre version 3.34.0. on my MacBook. I can't update Calibre because my MacBook has version 10.13.6 and the new version requires a minimum of 11... Can someone help me !?!?
