ARcore HelloAR

Hey! I’m trying to make a simple AR App for my university project, but i ran into a problem.

I have my ARCorePlaneActor, and it works exactly the way i want it to,with the first initial material.

However,my task is to add interchange-able materials or at least textures on the fly, so i did this:

Problem is, When I touch, nothing happens.

What am I doing wrong?