So there is no Kindle or Kindle/Documents folder in which to place your docs? It might be a file permissions thing like it was on my iPad and iPod touch and I had to use a 3rd party Windows application to access the appropriate folders. Don't remember all the details now since I haven't had either for a long time, but it could be that Windows Phone OS doesn't give access to certain folders without using some 3rd party app. Apple is bad about that but Microsoft normally doesn't try to lock down their file systems like that. Of course it could just be because the Amazon developers don't have the necessary skills yet to make the app comparable to other platforms.