Open an image from actionable notification?

I’m using node red to monitor for line crossing on my CCTV. When this is detected it takes a snapshot from my camera, saves it to media as per docs and shows it within my actionable notification, great. All working.

One notification button is set to open my camera dashboard and I’m trying to set another to open the snapshot.

But for the life of me I can’t get this working.
My latest code that I’ve tried is

  “action”: “URI”,
  “title”: “View Image”,
  “uri”: “source://media_source/snap.jpg”

There’s surely got to be a simple way to open the snapshot within the app?