Hello;
You have to fool the camera in thinking that there is a roll of film in it. Two ways of doing this is to load up a spool with just the backing paper rolled on. Then load the insert with the fake roll of film. Or take about three inches of masking tape and apply to one side of the spool. Then load into film insert feed side making sure the distance roller is riding on the masking tape. Load into the removeable back and attach to camera and see how it works. Steven.