You can store your downloads in your account when you signup!
Your start-up product or new app screenshot will stand out in this black on black image. The black Nexus 7 seems to be floating in space lying on a dark surface. The Nexus lies at a left angle in landscape orientation. The stage is a full 1920 x 1200 px. This mockup is perfect for a focused ad, unhindered by other items in the image.
Drag & drop not supported, but you can still upload via this input field: