You can store your downloads in your account when you signup!
View your product screenshot on this outside environment. The iPad mockup stage is being held up by two hands at a flat, frontal view. The background suggests a city street at dawn or dusk. This extra wide image has a blue haze with headlights shining through. The stage itself is at portrait orientation and 768 x 1024 px. Is your person waiting for the bus? At work? In the park? You choose the background!
Drag & drop not supported, but you can still upload via this input field: