Cloud (Save - Open) from different devices
I have an Android device and a Microsoft surface which runs on windows 8.1. I use Dropbox for loading the same document when I'm at work or home. The amazing save works on android for only recently added data to the file (annotations, highlights ... etc.) Saving time and effort. But when adding notes on the surface it needs time to save the document like it uploads it from the beginning :(.
Wish to add the same feature on windows which is more convenient actually for modifying, reading a document.