What is the best way to paint an existing PBR Material (i.e. one that I have downloaded) onto a model? My first guess would have been using texture painting mode, but as far as I know, this only allows painting a single texture at the same time. This does not work with PBR Materials, b/c all of the different maps need to be painted at the same time in exactly the same way.
Is my assumption wrong on how to paint PBR Materials or is there another way that I can not see?