So the whole idea, i am trying to achieve is, here - https://pcbeta.americreative.com/shop/canvas-sling-bag/
you can see , i have some art images to go over main product image. In the backend we can upload two images for design, one from add design and other from add design thumbnail, when we click on setting icon of main design. so what i would like to do when someone upload design thumbnail , it should visible into the hover box of the main art image or design image. I attached the screenshot for the reference.
Can you just tell me Where can i change the parameter so in the hover popup box , second image will visible, or vice versa.