Works with CiviCRM 4.7 and should work on CiviCRM 5.0 or higher
This extension adds functionality to add attachments to message templates. You can add attachments to templates by editing the message templates under Administer --> Communication --> Message templates. Updating a template through the e-mail screen does not work.
Screenshot (click to enlarge)
Since CiviCRM 5.x, extension releases compatible with CiviCRM 5.0 are compatible with 5.0 and later. An extension release compatible with 5.25, for example, means that it requires CiviCRM 5.25 or later.