You can store your downloads in your account when you signup!
A girl at a store’s dressing room trying out a red dress. She holds her iPhone 6 mockup looking at… your app or design. Maybe your website? You choose! Drop an portrait mode image or input a mobile-optimized URL to get started with this great and versatile iPhone 6 mockup. It’s better to show your app in context.
Drag & drop not supported, but you can still upload via this input field: