No sound on iOS

I use the MoviePlayer to show a loading screen.
The .mp4 video is played without sound.
Then I Create a new project based on the FirstPerson C++ template, then pack it to iOS, it have no sound too.

I installed the package on another iPhone, itโ€™s OK.
Still not work on my iPad air 2, ios version: 11.4.1

Check to see if silent mode slider is turn on

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If it works with headphones but not phone speakers thereโ€™s a good chance silent mode is just on. Donโ€™t know the work around in the code settings to make it play without silent mode on sadly.