Autosave and manual save
By default, the campaign editor saves your changes every 60 seconds. To manually save changes, click Save in the upper right, and select an option.

Campaign change history (undo and redo)
To view your change history, use the history, undo, and redo buttons in the lower left area of your campaign. These buttons do not appear until you begin editing the campaign.
Your change history is available on a per-session basis. This means that if you navigate away from the campaign editor (for instance, you save and close the editor, go to a different website, or simply refresh the page), you will lose your change history.
