If a student reaches out to you because they uploaded the wrong file, you are able to upload a new submission for them. Please read: Upload a Submission for a Student.
If a student alerts you that the file they are trying to review is corrupt, won't open, or is blank, you can check this by going to Student Progress and viewing the student details for the student who is reviewing. Look at the reviews this student has done for the assignment in order to locate the corrupt document and make a note of the name of the student who uploaded the original file.
Email the student who uploaded the corrupt file to send you a new submission. Once the author sends you an updated submission, go to your Student Progress page and click on the Details button for the student whose submission you would like to update. Click the Overwrite Submission button and follow the steps to upload the file. This will replace the original file with the updated one, but keep the previous reviews. Please reach out to any reviewers who had previously completed a review on the corrupted file to edit their reviews.
If you learn of a "bad" document from a reviewer and are waiting for the updated document from the author in the meantime, it may be best to delete the corrupt file immediately, so that it doesn't get assigned to more reviewers.
To do this, access the submission author's Details button on the Student Progress page and use the Delete Submission button. You'll want to record the names of all students who had previously completed reviews on the corrupt document, so that you can reach out to any reviewers who will need to complete another review. Deleting a submission will also delete all reviewers assigned to that document. Then, once you receive the updated submission from the document author, you can use the Add Submission button under that student's Details screen.
If you need assistance with this process, please email firstname.lastname@example.org.