Hi, I checked within the written tutorial to figure out why I could not swap out sprites and it turns out that it only works when a sprite is selected. Unfortunately, whenever the file prompt shows up for replacing a sprite it also deselects it, making the function useless. I'm checking to see if there's some sort of hidden hotkey to no avail.

i know why this is. i think i accidentally added it in 1.2, ill make a fix later today