If you opt in. the LMS will generate grading files for you and send them for grading. The details are here The various grades available for display in the LMS are described here
Graders can continue doing it the old way if they like. See details.
Events with a status of OK will be sent to the grading system automatically. Events with results updated since 2022-06-21 will be included next time the process runs. The Resubmit button sends the event for rating immediately, although it will get sent again the next time the automated process runs anyway