I have a student who needed to retake a quiz after it was due. The first time he took the quiz, he had a tech issue and wasn't able to submit any answers. I reopened the quiz for him and gave him an extra attempt. He says he retook it, but I can't find a submission from him that contains his answers. In the gradebook, his grade is a rocket symbol, and I don't know what that means in this case. Assuming the student actually did retake the quiz, where is it?