View Problem History
When you save a problem, either in draft mode or as Final, MATLAB® Grader™ saves a copy.
To view the problem history, select Actions > View Problem History.
By default, MATLAB Grader displays only the versions saved as Final. To view problem drafts also, check Include draft versions.
To view a particular version, click the date and time link.
When you are viewing a particular version, you can navigate forwards and backwards through older and more recent versions using the navigation arrows.
Restoring an older version is not currently possible. To use the content of an older version, copy and paste the older content into the current version.