Hello,
I am looking for the documentation in which form submission using external email template is described. I've tried locally using the out of the box template from: /libs/fd/dashboard/templates/email/htmlEmailTemplate.txt and the email that I get is a plain/text not an HTML. A simple example of how the email would look like is:

However, if I am using the same template in an workflow > send email step, the HTML renders and the email looks good.
What are the technical differences between submit action > send email + external template and submit action > invoke workflow + send email step?
Thank you,
Ana