by Tim Patterson.
Thanks for your response, Ben.
No, the "Require students click submit button" is not ticked. In other words the setting is currently "No".
I followed your good instructions to see what Moodle says about my student's submission of an assignment. The log says that her "Submission status: submitted for grading, the number of file(s): 0 file(s)."
She said that she was notified by the website that her assignment had been successfully uploaded and I was even notified that she had updated her submission.
The course is voluntary and not for any reward so there's really no motivation to fool me. She has been one of my better students.
I just can't understand why her assignment is not visible, as the other students' are.