Thanks for sharing.
It definitely raised my interest, and I made a little resarch for the entire film as you mentioned, but I couldn't find it. I did find the BBC documentary that attempted to narrate the story behind this footage, but in its whole I found it rather weak. I'd be a lot more interested in finding the original material. What I managed to discover is that it was transferred to digital and named "En dirigeable sur les champs de bataille", transmitted occasionally (?) on French TV.
In this blog
https://davidderrick.wordpress.com/2010/11/11/en-dirigeable-sur-les-champs-de-bataille/ there are old (2010-15!) traces of attempts of finding the film, apparently with no result.
Nowi, perhaps you were more lucky?