Using Unity 2021.3.18f1 If I change a RGB texture from "Texture Shape" of 2D to 2D Array Unity adds a alpha channel making it a RGBA texture and double the file size. Even if I change the "Alpha Source" to none this empty new alpha channel will not go away. Is there a reason for this? I'd like to use arrays instead of atlases, but not if the result is wasted memory from empty forced alpha channels. Is there a way around this that I'm maybe missing? Many thanks in advance for any help.