PW/Original Fire/Fire HD - Which Format?
I have all the above kindle devices, I currently convert my books into mobi files using the "both" option. I think that means it is in the K8 and older format. But using this some of the books does not show up as books on the Original Fire. Does anyone have advice on what would be the best format and settings for the books to be converted in Calibre and be seen in the appropriate book section on all the kindle devices? Should I stick with mobi files?