Okay, so I have figured out how to make it work….I need to make the first image of the Product Gallery the same as my Product Image. Then, add the video to this first image and Update. This seems to attach it to the Product Image. Then, delete the first image in the Product Gallery. This leaves me with one main image, the product image with the video attached. If I don’t delete the first image in the Product Gallery, then my product page shows 2 of the same images, both with videos attached