Templates creation now allows adding attachments and tracked presentations for Gmail and O365 users. Just create your template from the app site composer, click the icon in your composer toolbar and select your file:
Just like adding files to an individual email, PDF and PPT files will prompt the tracked presentations window, giving you the option to allow recipient downloads and require a name to view. Once your template has been saved, you can also add those templates to Campaigns:
When tracking from Campaigns, be sure to check off "Track Links" in the settings to the bottom of the window in order to collect attachment tracking events.