How to get the edge to light up for text messages- Samsung S6 Edge

[AC Question]

So I'm completely new to Android, and I just got the Samsung S6 Edge. I love the edge lighting feature where if you have your phone face down and one of your "people" contact you, the edge will light up with the color assigned to that person. However, this only seems to be working for calls. Under "select notifications" I have Messages turned on too. Is there anyway to get the edge to light up like that when receiving text messages?....I'm also using Textra if that helps.