Oh this seems weird. The expected outcome is supposed to be your image within the mockup of your choice! To be a bit specific, the options on the left are mock

Oh this seems weird. The expected outcome is supposed to be your image within the mockup of your choice! To be a bit specific, the options on the left are mockups for the images/screenshots that you upload! Currently we are still working on the image crop feature so that's still coming but the purpose is to make good-looking images for the purpose of sharing to your audience on social/newsletter/etc!