I am really new to Xcode and Swift so I think there is an easy fix but couldn't find it. Here are the screenshots.
In this screenshot there should be the diamond images which you can see in the second screenshot inside the red circle to use for UIImageView
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And this is the screenshot of the diamond images in different sizes to use for UIImageView:
I am watching a Udemy course and in the course when you add some images in the app icon folder you can see them in the red circle on Main.storyboard.