Put film in the Polaroid camera, and attach the Polaroid camera to a balloon.
We put some hot-wire under the camera to keep the film and camera warm when inside the camera.
Two Canon Powershots were included, and a GoPro to film it all. We had a seperate GPS tracker, and a flightcomputer with GPS
that reported its position through a Radiotransmission that was heared and decoded by radio operators from the UK, Holland, Belgium, Denmark and Czechia.
We were chasing the payload in our car from Holland while decoding its radiotransmission. Then the payload started floating on our atmosphere at 35km. We decided to drive back.
Later the balloon burst and the payload landed in eastern Germany. We knew where it landed, and after some calls our payload returned safely.
Exactly how you can make such a thing, including schematics, code, etc, you can find on my project reference, www.timzaman.com.