In the top right corner of the page, the Download or Share button can be used to export the newsletter into the format that best suits your medium.
Download creates a file (PDF) that can be printed or sent via email.
In most situations, you'll want to make sure that All Pages are selected for downloading. The Resolution should be set to Retina or Print based on whether you plan to put it Online or Print the document, respectively.
Share posts the newsletter to a specific URL that can be accessed by the readers.
Clicking the Down Arrow next to Share allows you to choose how you would like to share the Newsletter. You can Publish on the Web, Embed in an Email, Embed on a Website, or Post to your Social Media page(s).