In order to make sure that your email template is saved with the Email Editor, make sure that once complete, you click "Save" and then "Back" within the email editor. Not doing this will not save your template to the campaign.
In order to make sure that your email template is saved with the Email Editor, make sure that once complete, you click "Save" and then "Back" within the email editor. Not doing this will not save your template to the campaign.