Hi, took me some investigation to find a way how to get rid of the nice magenta rendering
I don't know if this is the only way or if I can delete any former materials directly, but I added a material node under the file import node and for the group I entered @shop_materialpath=="/mat/floor" as you can see in the spreadsheet primitives tab and as material I set a predefined Octane material.
Any other known/better way to handle this?