Custom notification on Galaxy Note4 : popup appears but no sound for new messages

I used "Custom Notifications" on my Galaxy Note 2 previously for some critical Whatsapp group
(which I need to respond urgently) by making new messages to pop up with a custom sound.

After migrating to Note4 (Note2's screen broke), I set the same custom notifications but only
the "popup" for new messages surface but no sound.  Is there a setting somewhere that I
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sunhuxAuthor Commented:
When I set up  Custom Notif on the Note4, I've chosen & selected the sound & it did sound
but when new messages came in, there's no sound (for the 5-6 critical Whatsapp groups
that I customize it).

Fact that pop-up works  means the custom Notification was set up.  I've also checked that
the volume of the phone is not muted : when there's incoming voice calls, it did ring
Vijaya KumarCommented:
check out notifications and sound bar in settings if it's available check application wise sound settings may be particular app sound disabled or muted

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