What’s the best way to upload a link to a stand alone HTML newsletter?

You will use the media manager button to upload a new html document (highlighted in red below). You’ll have to select your group’s name under the field “Your Groups” when prompted during upload. HOWEVER, it will upload the HTML in a way that you might want to display, filename.html differently.  Highlight your link and update the text, such as October Newsletter.

media editor -image