Materials not showing full detail on static mesh

Hi everyone,
So my problem is that I have imported a mesh from Sketchup (I used the autodesk FBX converter) into UE4 9.2, and when I try to apply materials to it, they just become basic colours.
Most of the materials are just from the starter content because I am just testing stuff out.

Here is the material just for reassurance

Thanks for helping in advance