Collab viewer material change


I used the collaboration template in unreal studio and added a material and color change system based on widgets. The user selects an actor with the laser and can then change the material and the color with buttons in a scrolllist. The problem that I have is that the material and color change does not get transferred between client and server.

This is basicly the way I change the material:

Please forgive me if I ask something stupid but I’m starting right now developing in ue4. But how can I make the material and color change transferred between host and client?