I was very happy to have received Alfred 3 today and was glad to see the Snippets updated with an auto-expand option. However, Once I set up in system preference, and updates a few snippets it turns out they do not auto expand. I attempted in Word, then in Notes in my iMac (late 2014). I am providing this info as user feedback. If there is any advice you have for using your auto-expand feature in Alfred 3.0 I would greatly appreciate it. Otherwise, I hope my feedback is of use to you.
Thank you,
Roger