As I remember educational films they always had narrow film (16 mm).
- Dyatlov group arrived to 41th settlement with truck which transported 3 movies (~30 cans with films).
- They (or some of them) had spend a night in a room of driver, according their diaries.
- Cimema film might be found in abandoned Second Northern mining settlement like a garbage (old movies e.g.with Stalin are garbage). We know, Yury Yudin found there materian for museum, so Igor possibly found something for himself.
They had problems with fire with moist woods so they possibly took material for inflammation, according manuals for tourists.
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Your theories about UPI stidio is an imagiantion as explanation. You imagine something and present it as a fact.
We know count of photo frames made during 9 days. They has about 9-10 unused photo films with 36 empty frames till end of their treck. Cimema film was definetely in separate can, not with money and photo films. It is mistake of investiogatoins that it was together with money. Protocol was written by handwriting of journalist Yury Yarovoy, not Tempalov. Only Tempalov's supscription was there.
Your explanations maybe are from Interview-2013 with Sharavin
https://dyatlovpass.com/sharavin-2MP: A sealed can of film that allegedly rolled out of the tent. What was it like? Was it round and flat, like a washer? Or another kind? And what was its diameter approximately?
MSh: I have not seen the can in which the film was found. At that time, hikers often used film in cameras for photographing.
MP: They say that scraps of film were found 15 meters below the tent. Yudin suggests that they could have taken pictures there.
MSh: I also heard that from Yudin.
MP: Mihail Petrovich, do you know the name of the Prosecutor Tempalov, who, they say, also took part in the search? Did you meet with him?
MSh: I met with Tempalov only once - on the 28th during the dismantling of the tent. I can't say anything about him.
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This was said by men which did not have neither photo cameras nor watches, nor binoculars in 1959. They may imagine everything.