console command stop working??????

hey
i am trying to add tonemapping to my mobile project as default following this (Post Process Effects on Mobile Platforms | Unreal Engine Documentation)
and opened the console and typed “r.tonemapperfilm 1” but nothing working and tried on the device but the same and i
add r.tonemapperfilm=1 to the Rendering Settings section of the project’s DefaultEngine.ini file but nothing working
please Help.
forgive my english.