You need to to put the film under the roll, more exactly between two rolls, only on the automatic models of Rolleiflexes. This is how they detect when the film suddenly becomes thicker at the joint paper-film. (Where the film itself begins.)
On Rolleicords and non-auto Flexes the film goes over the rollers.
Too bad you scratched the first film. That first image was funny and good.
Nice idea of a background too.