Question / Problem
How do I import an HTML file so it will appear as the body of the email message? I tried attaching the file saved as an .html extension. But when I sent out the email, it appeared an an attachment, not in the body of the email message.
Answer / Solution
In the toolbar of Step "3. Content" you can find a button named "Open" which can open/import HTML-Files to use them as boy of the mail.