I imagined that it would create new UV maps of the torso and leg surfaces that I painted over but, if it does, I don't know how to tell it to do that or where to find the results if they are saved somewhere. I had managed to get that far already and have painted on the figure as I want to but I'm now stuck at what to do with it. Oh, and note that if you want to see a preview of how the material will look when rendered, you can switch to Material Preview mode (top left of the 3d viewport). Enter Texture Paint mode, use the '+' icon under Texture Slots in the Active Tool Settings panel to add new textures to each material as necessary (e.g., start with adding Base Color textures to the torso, face, arms, legs, etc.), and start painting. Like I say, though, if you don't need to actually see the 2d UV layout as you're painting, you can just ignore all of that and keep doing what you're doing. Yeah, UDIMs can be hard to wrap your head around, and I'm probably not the right person to try to give a detailed explanation. I read the Texture Paint section in the manual (several times) and there is no hint at what I am doing wrong. I'll open it up again and play but I always seem to fall at the first fence with Blender because there are so many things that are not explained. Worse still, I don't understand what I need to do to get into the right mode in Blender.

I still don't understand what the difference is between a UV map and UDIMs. Thanks - I watched that video and was totally lost :(. If you don't actually *need* to see the correct UV layouts when painting - i.e., if you're only going to be painting in the 3d viewport - then you should be able to just ignore the Image Editor.

Painting in blender