How to enable post processing within menu button link

Currently I am having an issue with enabling or disabling a post process volume with a menu button click.

I have setup the blueprint as per the attached!

The problem is that the on click for the menu button is only present within the menu widget. If copied across to the sub level blueprint it does not output.

I am also having an issue with the post processing event being enabled by default, before button press. I can rig up the blueprint with a on key press to enable or disable the post processing volume in the menu, though I am unable to map this to a menu button.

Overview.

  1. Created a post process volume within sub level
  2. Require button to trigger post processing event.
  3. Menu button not triggering event, though keyboard press will.
  4. Post processing is enable by default, this needs to be the opposite way around.

Please help.