r.CompositionGraphDebug doesn't generate any file

[anonymous_user_55d05049]

I’d like to try r.CompositionGraphDebug.

So I made Cell Shading with Post Processing.
My reference is following.

Post Processing in UE4: Cel-Shading | Live Training | Unreal Engine Livestream

And then, I play it, put the command r.CompositionGraphDebug.
But any file isn’t generated…

I’m very confused…
Please help me.