Problem with the volumetric local fog


I just start on ue4 and I’m working on my first project, so I want to apply a local volumetric fog, and I already follow the instructions to do it with the ue4.21 version and it worked very well, so now I wanna do this again in the ue4.23 and it doesn’t, I don’t understand why.

I made the material, I customize it a little, after that I run it through a particle, set the light and the exponentiel fog and it worked. I do all this once again, I read all the volumetric fog ue4 docs Volumetric Fog | Unreal Engine Documentation , and i don’t know what I forget.

So, it will be welcome if someone can help me to solve this problem.

My computer run with
-i7 4770
-nvidia GeForce GTX 1060 6GB VRam OC

Thanks for your help!