2nd svg/stl to Model default color

Hello,I seem to having an issue and I can not seem to finda a solution, (which is wasy im sure and i missed it)

I have a tile basic Rect. 4 colors using CFS. then when i add Additional svg/stl , i can not set the color from the cfs. It goes to “Default” color and the preview on the slicer goes to one or two colors only (b & W)

I would like to keep the model 4 color and add the additional file to a color assigned from the cfs. maybe you cant

Any help would be appreciated.

thanks