I have made a custom module to add some html input fields in Admin Order view. What I want to do is when clicking on the Send Email button in Order View, the information typed in the html input fields would be passed to the email template. How to make this possible?
My question is different from Get my custom variable into an email template as I need to pass text from input fields directly to the email template. Please note the text in input fields is not saved in the DB.