Your input has been incredibly helpful, but I'm still stuck on one situation that I hope you can advise on. For variants, our products typically offer many combinations but do not have specific photos. (Same product but different size. No extra photo needed.) Your advice on how to show this works correctly and it shows all photos related to the productId. The challenge is that we do have a handful of products that actually have specific combination photos (Different colors) and shouldn't show all photos from the product. I haven't figured out how to make the two settings work together for the additional image link node.
If I set the restriction to combination photos, it only populates images for my handful of products with combination photos.
If I set the restriction to all data, it shows all photos for the product, including for those products that have specific combination photos. (Red hat variant is showing red, but also blue, black, and all other color product photos.)
Any advice on how to set this up to handle both scenarios?