Heads-up notifications do not appear on my Nexus 5x

[AC Question]

When I get a notification (while using another app) it appears only on the statusbar not as a Heads-up notification. It worked great on my Nexus 5.

 

[H2OLimos]

Same here. I get no head's up notifications, pop ups or other. If I do not see the icon appear in the status I can potentially miss a text, email or other notification because I did not know I have a message. This has already happened to me on several instances. I miss the LED flash and then pick up the phone and the icon is hidden by other notifications at the top. The specific app icon does not have a number or other notification on it as well. Something needs to change or my phone may be the thing changing.

Hopefully we can figure this out as I like the phone, but the notification issue could be the difference on whether or not I keep the phone.