You can store your downloads in your account when you signup!
Display your app mockup on this illustrated Samsung tablet. The Samsung mockup is in a womans hand. The woman is wearing colorful bracelets. The Samsung Tablet is held in landscape view. You can pick different colored backgrounds to go with your app. The mockup will hold an image of 1280x800px. This is the perfect place for a flat design.
Drag & drop not supported, but you can still upload via this input field: