UNREAL UE4.19 - Impossible to apply material to destructible chunks, why? images attached

Hi, i created a destructible mesh, but shunks dont show any material inside, so what it does, is that it takes the texture from outside and repeats it in the inside of the chunks and I actually used documentation to try to fix this:…shooting_Guide

In this first image “material” tab it´s completly different from documentation, i added up to 4 new materials (here you can see #0 and #1), but it only uses the first one “0” then repeats it inside for the chunks:


Here is the material tab in the documentation, very different:

Please help, thanks!