Camera post process and pp volume priority

Hey, I have a question about camera post process and post process volume

What I understood is that basically:
camera post process = global
post process volume = local

anyone knows what are the priority ? Does the camera post process takes priority over the pp volume? does it blend together ?
From my test they seem to blend together but i’m not sure.

What are the best way to use it ? for my game I have the cam pp that does a fov change when in cinematic, and the pp volume is used for any color change, basically using the cam pp in area where it would be too much of a hassle to overlay 2 pp volume and place them perfectly

thanks