You can store your downloads in your account when you signup!
A man works on his Nexus 7 with a stylus. He sits at his work desk. To the left of the Nexus 7 there is a laptop keyboard. To the right a small desk lamp and a couple of sections from the newspaper. The nexus 7 holds a mockup image of 1200x1920px. This is the perfect set up for a work app that requires a stylus.
Drag & drop not supported, but you can still upload via this input field: