It only works for uploaded images because if you copy and paste directly, it doesn’t work, as I think it doesn’t detect the quantity. I don’t download images just to upload them later; I find that it wastes time, especially on a mobile or tablet. That’s why, on my end, I use the grid tag and paste my images directly via copy-paste. Maybe there’s a way to make it work in grid mode by copying and pasting images. For me, the goal is to save time. It’s fine for me, but I think users aren’t using this feature because it requires too many steps.
But there’s something for everyone, and maybe quite a few people upload images, so don’t change anything for me 