Instantiate upward with layout group

I don't know anything about layout groups personally, but if you can't find a way to make it work you would want to basically make the system for listing your images yourself. Basically, the position of the images on the screen should be independent from their position in the collection, so you can keep adding and removing images from a List or Dictionary and it wouldn't affect other images' position on screen. Instead of your "base" image being the one at the top of the screen and listing down, your base image could be the one at the center of the screen and you expand both upwards and downwards every time, even at the start. When you move the scroll area, you change your base image to the one that is now at the center of the screen, and check that there are 10 images loaded above, and 10 below, and unload the ones that go further than that. Hope this helps, although I think there's a chance Unity already has something built in to do it for you so you may want to dig through the documentation more before going through all this code logic.