S6 Edge Text notification.. No sound. How can I get it?

[AC Question]

S6 edge Text notification... No sound

My S6 edge recently updated to 6.01 and I've noticed that whenever I receive a text message, there is no sound. The sound is on, the volume turned up, but no sound notification! I use the default messaging service, but a SwiftKey keyboard. Could that be causing the problem? Someone help! If I wanted only vibrate notification, I would keep my phone on vibrate!