Add the First Screenshot
Add a screenshot of your app. If you don’t have one, you can skip this step.
             Upload a screenshot
          
          
    Drop  here or
    Choose
  
  
             Add an image URL
          
          
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This does not appear to be a working screenshot URL. :(
The URL should be a valid image with a standard iPhone screenshot aspect ratio.
(Also, this URL needs to be CORS-enabled so we can manipulate it in the browser.)