One of the major reasons is exposure settings. When taking pictures from the ISS most of the time there is something else in the frame which is brightly lit; remember that there is less between the ISS and the Sun than there is between you standing in an open field at high noon. Can you see stars then? Of course not, they would be too faint for the ambient lighting.
So if a camera was set to show stars whatever else in the photo would be a blindingly bright smudge overtaking the entire frame.
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