Can we see how we make a change to that flat UV map and how it applies to here?

I can attempt to, but I might not have that working file anymore. But I can probably get it to work. So with Substance Painter, if I exported this in there, it wouldn't work very well, because every different material I have applied in Painter would show up as a different texture set. So it'd basically break out all the geo as you see it here, and that's not really usable like that.