ATEM Mini Extreme : SUPERSOURCE

When I choose "foreground" the image / source appears full screen.

When I choose "background" the image only appears on the top half of the screen. The bottom half is black.

The image is 1920 x 1080?

It's Position hasn't been adjusted at all?

I don't see the effect

Under ART in Supercource you can place a graphic that can either be in front of the boxes or in the back. So when you choose foreground and have a graphic without "holes" in it you will not see any boxes at all. If you choose background and only see half of the screen you have a box that doesn't have any picture in it blocking that part of the frame.
To be able to use the super source you use the presets and in box control adjust the number of boxes that you want you use and where you want then and what source you want in it. Play with the different layouts under presets to get some ideas of how to use the super source.

Create a png and cut out where you want the image to go and put it in the media player. The switch will cut out the alpha channel when you place it as a foreground automatically