Why is there no audio sharing from vCastSender for Android while screen-mirroring to ViewBoard?

This is due to a privacy policy by Google – Android phone/tablet. Google only allows apps that are pre-installed on your phone/tablet to capture audio, and prevents third-party apps from recording audio in order to avoid user privacy invasion. Therefore, third-party apps cannot access the phone/tablet for audio output.   

Why is there latency sometimes?

Please check the network being used. 2.4GHz Wi-Fi is very susceptible to interference from surrounding electronic devices, resulting in network instability and a poor screen playback experience. For an optimal user experience, 5GHz Wi-Fi band is highly recommended.

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