In testing, the published assessment must have the following label:
The instructor must check the option that states:
Autosubmit saved student work after latest acceptance date, unless student has previously submitted
As instructor, create a short 2 question assessment
Set a due date/retract date for 10 minutes out.
Check the autosubmit box mentioned above
Set submissions to unlimited
Save and publish
As student, take and submit the first attempt
Start a second submission and leave before submitting
As admin, let the assessment retract date pass
In Job scheduler, kick off the autosubmit assessment job
As instructor, go to the scores page of the assessment
Select to view all submissions instead of only the highest submission
You will see the second attempt was autosubmitted.