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Device testing
This function is available only on computers but not mobile device.
Browser
Reminder：
Requires the latest vesion of
Chrome browser
Microphone
Reminder：
1、Ensure the speaker is not muted；
2、Ensure speaker is available；
3、Ensure permission to use speaker；
Audio output
Camera
Reminder：
1、Ensure camera device is available；
2、Ensure permission to use camera；
Resolution
Connectivity
