Mission Planner 1.3.58
With Use AMSL Alt checked I get this message:
Photo IMG_9455 processed from CAM Msg with 0 ms shutter lag. AMSL Alt NOT found
Update: It appears that above mean sea level values are tagged to the image even though the message indicates AMSL Alt NOT found.
Excellent utility! with CAM Message Sync it makes geotagging images a breeze.