Currently there are two ways to accomplish this. We are aware that many of you would like there to be a "re-submit" options for students available without a push from you. This has been submitted as a feature request.
Allow "re-try" while grading from your "to-do" list
You may send items back to students as you grade them by clicking "allow re-try" in the grade editor.
The second way to send work back to students is to use the "Batch Update" feature in the gradebook. When viewing a specific activity in the gradebook, click on Tools (wrench icon), and click "Batch update scores" from the dropdown.
Click on the "Allow re-try" tab.
You now have the choice via the dropdown menu to send the scores back to students in a variety of ways.
Echo is constantly being improved based on the feedback from users and we strive to keep our documentation up to date. If this document doesn’t match what you are seeing in Echo, please let us know.