I would like to make a little customisation on the Admin End to Newsletter Templates.
When you create new template (Marketing -> Communications -> Newsletter Templates -> Add New Template) there is a field Template Content. By default this Template Content Block is being placed inside the <body> tag of the email's html. I want to be able to write whole HTML document inside Template Content.
Second, i have a ready for import .csv file. Just need to transfer it into the system.
We are running Magento 2.3.4