I have recently upgraded my Samsung Galaxy N3 (SM-N9005) to Android 5.0 in the hope that I would get the heads-up style notifications. According to online resources I have found, this option is called "Allow Peeking" and is found under the notification options for each app.
However, when I go into the notifications for the apps I have installed, none of them have the "Allow Peeking" option.
Is there something else I need to enable? If not, how do I get the "Allow Peeking" to appear?