Although this was tested on OP6T, it could be working for most Android Oreo phones and later, so it bothered me not to have an LED notification light on OnePlus 6T, so I tried to make mine. The notification arrives that the application brings on a black screen with LED notification that looks like animation.

Supported Android
(4.1 and up)
Ice Cream Sandwich (4.0 – 4.0.4),Jelly Bean (4.1 – 4.3.1),KitKat (4.4 – 4.4.4),Lollipop (5.0 – 5.1.1),Marshmallow (6.0 – 6.0.1),Nougat (7.0 – 7.1.1),Oreo (8.0-8.1), Pie(9.0)

Download NotifyBuddy AMOLED Notification Light Premium v 1.42 APK

NotifyBuddy_v1.42_[Premium_Mod_By_Stabiron].apk