[bigeyes]

I have a current generation Oasis on the latest firmware.

On older kindles, I had no problem converting EPUB files to MOBI and loading the resulting files directly to the Kindle.

On the new Oasis, some old MOBI files did load. But newer files, especially form News Sources downloaded from Calibre, do not appear.

I have tried using AZW format but that does work either.

Any tips on best formats for latest generation Oasis?

I did try letting Calibre do the file management and conversions and that did not work either.

For what its worth, none of the files are encrypted.

I can't use these files on the Fire HD 8 either. Realistically I never did figure out what format works for the Fire HD and the Kindle app. I did purchase Moon Reader and that works. Of course that is not an option for the Oasis. But if anybody has ideas for the Kindle while they are at it I will be open to thoughts.