Solved Quickplay map preview image

The map I'm making doesn't have a picture in the quick play levels selector.

Where do I define which image to use? The map has a picture (or 3) in the free play level selector. I tried looking at the official maps but couldn't find what I was looking for.

 

I believe the game looks for the image named levels\yourMapName\yourMapName_preview.jpg

 

Thanks! That worked!