Hyperlinks, images and HTML can be added to email templates on the Communication Settings page.

Add Hyperlinks, Images and HTML

The process is "old school".  Simply use standard HTML tags. Images display and hyperlinks work from most any email client.

Obviously, be sure to visually and functionally test any HTML you add.

Add Documents

ShowMojo does not have a capability to add files, such as a PDF, to your emails as attachments. But you can send links to files that you host on another service, such as Box.com, Dropbox, or your own publicly-available file server.