Essential Grid

Hello!
This is an awesome plugin that honestly is the only good option for this functionality out there!
I have a question about the locations it adds the image. I am using posts to feed an essential grid. The featured image is supposed to supply a background to each grid item. But the random post thumbnail does not effect this, and my grid is blank. What can I do to get the two plugins to work together? Where does the random post plugin set the images, so I can try to set my essential grid to pull images from the correct location.

Thanks for the help!