Finally got it to work. This is how I got my Edge to blink flashing green lights every time I had an incoming g-mail, for example (whether charging or not):
DEVICE \ SOUNDS & NOTIFS:
NOTIFICATIONS ON LOCK SCREEN Show content
LED INDICATOR: On
DEVICE \ SOUNDS & NOTIFS \ APP NOTIFICATIONS:
G-MAIL
Block notifications No (off)
Set as Priority yes (on)
Hide content on lock screen No (off)
Notifications Yes
Inbox sound & vibrate Notify once
Label notifications Yes
Sound Silent
Vibrate No
Notify via sound/vibrate for ea message that arrives No
LIGHTFLOW APP NOTIFICATIONS
Block notifications No (off)
Set as Priority No (off)
Hide content on lock screen No (off)
PERSONAL \ ACCESSIBILITY \ NOTIF REMINDER:
Notification Reminder On
Vibrate On
LED Indicator (blue) only if NOT charging On
Reminder interval 15 secs
Select appliations: G-mail On
PERSONAL \ ACCESSIBILITY \ SERVICES \ LIGHTFLOW: Off
RESULTS:
LightMgr Sound Peanut
LightMgr Vibrate Medium
LightMgr LIGHT Green