Trying to upload video from computer files in react native

Question

I'm currently using expo-av to show videos on my website in react native. The videos that expo-av provides comes as a uri link, but I want to allow people to upload videos from their computer files in order to post videos. Can someone show me how to do this? My code so far is:

const video = React.useRef(null);
  const [status, setStatus] = React.useState({}); 

<Video
        ref={video}
        style={styles.video}
        source={{
          uri: 'https://d23dyxeqlo5psv.cloudfront.net/big_buck_bunny.mp4',
        }}
        useNativeControls
        resizeMode="contain"
        isLooping
        onPlaybackStatusUpdate={status => setStatus(() => status)}
      />
      <View style={styles.buttons}>
        <Button
          title={status.isPlaying ? 'Pause' : 'Play'}
          onPress={() =>
            status.isPlaying ? video.current.pauseAsync() : video.current.playAsync()
          }
        />
        </View>