Scalar Paramaters in Blueprints?

Hey , cheers for the help. However i am still having issues. I have set it up the same as you have above but the texture still doesn’t update ts emmisive change for some reason. is there any reason you can think as to why this is happening? are there any prerequisites for these types of actions to happen that i may of missed. tick boxes? something in the material? atm i have a material instance constant set up in my materials, but i’ve tried it on both this material and the original parent :L
Ghaa should work

Thanks