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For about a year now I've been trying to figure out how to put the 'paint' I'd put on some .obj files in 3D Build into some sort of image file that I can apply to models in Tabletop Simulator. I managed to do it with some pre-existing image files and a cube in Paint 3D but the option to export seems to have evaporated. Currently I'm at the stage where it seems reasonable to do something with the UV Map in Blender.

Aside from not really having the computing power to run Blender, I've come up against the automatic unwrapping of the UV Map, in that I would need to be able to mark up the model in Blender to get it to unwrap into something recognizable, and also to get it to behave itself when I upload it alongside the .obj file it was made from on TTS. Is this making sense?Does anyone know what to do here?

The topic you're looking for is UV unwrapping, and there's a lot of useful information about it on youtube. Select edges in edit mode, then mark seam. An object's UVs are a part of the .obj file, so you'll probably just have to name and import the textures to a particular folder or point TTS to it.

Thank you! I'll see what I can find on YT!