Originally Posted by Shykat
So, if I register my Kindle app with Amazon on each device, they will be able to "share" the files so I can read on my iPhone and then open the same book on my desktop and be able to use the Kindle app there and it will open the same book at the spot where I stopped reading?
Sorry... It sound simple but not sure if my muddled brain is able to follow all of this.
Correct but for one thing: Kindle for PC and Mac won't be able to download Personal Documents, so you won't be able to read your uploaded books on these...
However, it works with iOS and Android (plus of course, all the Kindle devices)