I made an e-mail in a campaign using the advanced builder and saved it as a template. Then I went to a contact that I wanted to send the e-mail to, as a one time e-mail with an attachment to it. However, when I go to the contact and click on the templates it does not show up.
As long as the files are less than 10mb you can do them as download clickables in the email instead? I know thats not exactly what you want, but it is a working solution.