Per Instance Random not Working for Rhino Blocks

Hello - I used Datasmith to import Block Instances of a box with textures so I can offset their UV’s in Unreal to achieve a random look. However, the Per Instance Random doesn’t seem to work even though I have successfully imported my Rhino Objects as Instances. Whag do i do?

Is there really no one that will help me on this? Not even Epic Games employees?