I'm trying to create an atlas of collideable objects in Godot's tilemap editor. My understanding is that, to select a region of tiles to make part of the atlas, you have to mouse select (I tried clicking a cell and holding Shift but it doesn't select multiple cells). The issue is that I can't seem select a non-square region.
I also tried selecting cells one at a time, adding the collision area, and then picking a new cell, and what I end up seeing is my range of cells shift over to the new area. Do I need to re-create my tilemap source to just have contiguous regions, or is there some Godot functionality I'm missing here? FWIW, I was following this tutorial to get up and running.