Ahh I see what you’re after. I would temporarily connect the metalness to the Color socket of your shader (yellow line in the image below).

This way you can paint it as if its the color map, which is helpful visually, and your normal map would be visible as well. That’s a more accurate visualization to what I was doing in the video.
Then when you’re done or want to check the map’s effects, plug it back into the metalness socket.