What about something without words? Music in the background or whatever, but show the essentials of why film is important. It lasts a long time, it can be viewed no matter how technology changes.
(Recovery of Lunar Orbiter images. The project is tricky because the film was developed and scanned in space, and the results were beamed back. 40 years later, there are only two refurbished 70mm data tape decks on the planet, and one was found in a chicken coop. Restoring Instant Analog Photographic Technology)
Show what it looks like when film is exposed and the resulting print.
("Don't Panic. Shoot Tri-X. Don't Panic. Shoot Tri-X. Don't Panic ...")