At the top, select which attempt submission to view
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Click "Attempt 1"
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Ensure a grade is inputted for attempt 1
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Now, click to the next attempt
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Ensure a grade is inputted in attempt 2
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In this case, because this assignment's setting is set to "Last attempt with a grade", the Final Grade takes the grade from attempt #2. However, you can always override it by manually entering a grade in Final Grade