Originally Posted by daffy4u
What does all of this mean? I don't know, I just found it interesting.
I think it means... don't go trying to sync non-Amazon content when your Amazon archive has that content in it already.
Seriously, though... I'd test it on books that you don't
have Kindle versions of already. That way, it doesn't exist in your Amazon archive... and you won't potentially be mixing and matching different versions of the ebook file.