Unable to capture image

[darrenaf]

In the last few days the camera.snapshot facility has stopped working. I've been using the following for several months and about two days ago it just stopped saving new images....
entity_id: camera.front_door_snapshot
data:
filename: /media/CCTV/Greenford/MM{{ filename }}.jpg
action: camera.snapshot

Ive got a few camera using this, but only the ring cameras have stopped, other makes are working as expected. Any ideas what's changed?