icon does not show image, shows a file "PNG" icon instead

[SuperBox64]

let icon = Bundle.main.url(forResource: "bless", withExtension: "png")

When I use the above code, and add an image called "bless" to my App, I am not get the actual image icon, instead I get a file icon with the letters "PNG" on it.

Are there any specs for the image such as image size, or any thing else that might be missing?