Thanks for replying! Will check out that course after this one.
Specifically at the 04:17 [4 minute 17 second] mark of the video where you disable shadeless, using the GLSL preview to paint metalness while being able to see the bump map. Also recently changed to Blender 2.9.
Not sure why there’s an extra Untitled image in there, just ignore that. Blender crashed while doing this lesson so treat it as if I just started this part of the lesson.
https://drive.google.com/drive/folders/1NzExqLG2PyHx3CN-SUDTlQXnlSCbgJAU?usp=sharing
(Ignore the horrendous design/color scheme lol, not much experience texture painting)