Docs (AKA non Amazon books

) work just fine with TTS on the Fire 6". Funny bit, I was listening to something on the KK where one of the characters is named Presley. A sentence that ended
... "coming from a half-pint like Pres."
was read aloud
a half-pint like President (the KK seeing 'Pres.' as an abbreviation).
The Fire read the sentence out loud correctly with the nickname.
(Most annoying book I listened to on my KK had a main character named Max... every sentence that ended with the dude's name, it was read Maximum!)