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Click Add button, you can add audio file and import the audio file via the USB
device.
The audio file can be saved on the HDD or on the USB device.
If there is a USB device (containing the audio file) and the HDD (containing
the audio file) at the same time, the HDD mode has higher priority. That is to
say, NVR uses the audio file from the HDD.
Account
Here is for you to implement account management.