The default setting on iOS is to immediately upload every new image (photo or screenshot saved to the camera roll) to iCloud. Screenshots default to saving to t

The default setting on iOS is to immediately upload every new image (photo or screenshot saved to the camera roll) to iCloud. Screenshots default to saving to the camera roll (and contain quite a bit of auxiliary data, btw). On the web, the default and sometimes only way to save an image is to add it to the camera roll.