You can store your downloads in your account when you signup!
Show off the coolest sound-mixing or music app on this stage with the keyboard on the top right, and a few other musical equipment stations around the iPad. The iPad will hold an image of 1024 by 768 pixels for your mock up to look perfect in landscape view. Everything is set on a dark wooden table.
Drag & drop not supported, but you can still upload via this input field: