Thank you for the very exhaustive answer!!
I think we had a little misunderstanding.
I don't intend to publish documents. I'd like to read, make annotation as I would in a book and like to be able to review my annotation on the computer.
However, you still provided usable information!
1) Do you have a screenshot on how annotations made on a Kobo reader are presented in callibre?
2) Does Kobo use an open format for their comments?
3)
> PDFs may need a 10" or 12" tablet or a Kobo Elipsa (10.3")
Why is that?
Regards
DarkTrick