I recently purchased a second-hand Fujifilm Instax Mini 7S instant camera.
I bought new film for the camera and have now tried several rolls. On the 2nd roll I was very careful not to expose the film to light or touch the film or cartridge.
Unfortunately, the shots are all coming out as shown below.
A wavy white region at the top, either somehow undeveloped or very overexposed.
The photos all come out with a similar splotchy pattern.
The film below this white region seems to develop normally, and in that region I have gotten some perfect exposures and colors.
What is wrong with the camera or the film? Is there any way to fix this?