Why won't the notification LED blink while apps are running?

[AC Question]

Is there any way to make the notification LED blink while apps like YouTube are running? I hate having to constantly check the notification bar by flicking down on the screen just to see if I've been replied to or not.

 

[ManiacJoe]

Which phone?
Which version of android?
Which carrier?

 

[Jeffchicken]

Galaxy S7
Nougat 7.0
Virgin Mobile

I'm the original poster I had to make this account to reply.