Students may attempt to edit assignments after being submitted. This information will be used by teachers who wish to determine if a given assignment has been edited after submission.
Teachers can see a live link to the file by clicking on the file name. There's also a [Snapshot] in brackets. This is a separate link that provides a direct download of the file exactly in the state it was when it was first submitted.
E.g., if the student submits a Google doc, teachers can see the document as it is right now (including student edits) by clicking the first link, or it can be seen in the state at the moment of submission by clicking the Snapshot.