I see, thanks for clarifying your initial post, that helped a lot.
The way you described it appears to work only with the color attribute?
Not with any custom attributes which have nothing to do with the object color?
If so, this workflow doesn’t work for me, as I need more than 4 channels / types of attributes which drive various material aspects.
Is there any sort of node or way which lets me pick exactly which attribute I want to get data from? So I’m not limited to what’s stored only in the vertex color attribute.