Require students click submit button - If enabled, students will have to click a Submit button to declare their submission as final. This allows students to keep a draft version of the submission on the system. If this setting is changed from "No" to "Yes" after students have already submitted those submissions will be regarded as final.
Maximum number of attempts - The maximum number of submissions attempts that can be made by a student. After this number of attempts has been made the student's submission will not be able to be reopened.