You can store your downloads in your account when you signup!
A girl walks around the mall while holding a golden purse on one hand and a Samsung S5 mockup on the other. Her smile indicates she loves using… your app or website! For this Samsung S5 mockup in landscape mode, you can upload an image that is 1080×1920 px in size or choose a URL. It will work better if it’s a mobile-optimized website. If you have an instant messaging app, or any casual use app, this stage is for you.
Drag & drop not supported, but you can still upload via this input field: