✔ 最佳答案
You've just ruined your camera. The black plastic sheet is designed to cover the film for a short time after it's been pressed between the rollers. The idea is to keep the outdoor light off the film for those seconds before the chemicals begin to develop your image.
A new film pack won't correct your mistake, as the sheet is part of the camera.
參考: Photographer learning from 50 years of experience.
Formerly in camera & video sales & training.