If you have access to the Message Center to create, or send, emails, you will see the toggle for the “HTML Editor”. This is for our advanced users who use an external tool to draft their emails. Any changes to the HTML will automatically show in both the desktop, and mobile phone previews. The text editor will update as well unless you have previously made a change in the text version in this session.
To learn more of how to add images while using the HTML editor, view the details here.
Autosave is only enabled for the WYSIWYG editor.
Once the HTML editor is enabled, and the campaign saved, you cannot disable the HTML editor and go back to the WYSIWYG editor.