You can store your downloads in your account when you signup!
Double down on this two stage mockup! Place your new app screenshot into the iPhone 5c, and your start-up product screenshot into the larger iPad. Both units are portrait oriented and left angled. They lie on top of a wood block table. The floor is a light grey carpet. To the right of the iPad lies a white stylus. Stage A is 640 x 1136 px, and stage B is 768 x 1024 px.
Drag & drop not supported, but you can still upload via this input field: