But I guess you can use the second UV set for R/N/M maps. Substance will recognize materials, so if you assign specific Material to specific part, substance can use it.
I will need to look into that, unsure what it is - thanks will check it out. If I was to use multiple UV Channels, is their a way for Substance Painter to recognise all the UV Channels? With my last project I needed to export an fbx file eachtime I need to paint on a UV Channel.