In the smartphone version (app/browser), a mode has been added that does not receive video and only plays audio, even if the app is not in the background.
When you press the image quality switching button, it switches in the order of "HD (high image quality mode)" → "SD (low image quality mode)" → "audio only mode".
The high image quality mode is about 2 Mbps, the low image quality mode is 600 Kbps, and the audio only mode is 150 Kbps at most, so you can reduce the amount of communication.
