If you’ve read the part earlier mentioned about metallic foil stamping, the method will be very easy to photograph. Inside the stack of elements: your cover on The underside. Over it the (optional) foil and then the metallic stamp (die) having a reversed version within your sort or design protruding. https://www.slideshare.net/slideshow/maple-publishers-redefining-the-self-publishing-experience/273162128