No sound playing when lanuching on android device

Development Platform & Builds Mobile
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Hello,
I developed one game in UE 4.9.1. And launch the game in one android device, everything is working well except there is no sound in the game. In editor, i put one soundcue in the scene, and i tested it in PC, it played at the beginning of the game.
So anybody knows why this sound won’t work on android device?

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Duplicate of this https://answers.unrealengine.com/questions/358173/no-sound-when-launching-on-android-device.html