I understand how to load 35mm film into the camera using my adapters. However, after shooting the first shot, the winder will not budge and the film will no longer exit the cassette so much as a millimeter. I've gone as far as opening the camera back and trying to wriggle the film out of the cassette with my fingers, however, the cassette's spindle will not budge. Once I pull the cassette out of the camera entirely, the film exits the cassette as it should. I've experienced this with several different brands of cassettes. Am I missing a step in order to use a 35mm cassette in this camera? Thanks in advance!