How to fix 'Video play but don't have sound on iOS with expo'

I use video component from expo. I can play video, but it doesn't sound in iOS. In Android it's okay. How can I fix it.

<Video style={{ width: 340, 
                                height: 220,
                                borderRadius: 10, 
                                overflow: 'hidden' }}
                                posterSource={require('../../assets/loading2.gif')}
                                usePoster={true}
                                rate={1.0}
                                isMuted={false}
                                useNativeControls = {true}
                                volume={1.0}
                                playsInSilentLockedModeIOS ={ true }
                                resizeMode='cover' 
                                shouldPlay={true} 
                                source={{uri : url}} />