1. Keep WiFi and Bluetooth on; 2. WiFi and Bluetooth connection distance is within 40 meters of accessibility, beyond which it will not be able to connect, or there are obstacles blocking the signal within the connection range, such as walls, houses, etc., it will also not be able to connect; 

1.If the camera's current Wi-Fi and Wi-Fi you want to switch can be connected at the same time, you can switch Wi-Fi directly by selecting Wi-Fi network in the settings interface. 2.When the camera is disconnected from the current WiFi, the app will display "Device disconnected". Click Troubleshoot to connect directly to another wireless network. Or remove the camera from the Tuya Smart and then connect the camera to the Wi-Fi you want to switch to. 

1.If the camera's current Wi-Fi and the Wi-Fi you want to switch can be connected at the same time, you can switch Wi-Fi directly by selecting Wi-Fi network in the settings interface. 2.When the camera is disconnected from the current WiFi, the app will show "Device disconnected". Click Troubleshoot to connect directly to a different wireless network. Or remove the camera from Tuya Smart and then connect the camera to the Wi-Fi you want to switch to. 

First remove and reset the device in the APP, then configure the network for the device again through the APP. 

Yes, it works with any camera as long as the camera has a external mic input. But you need to set the output volume to low levels, and listen on the headphones jack of the A7s to make sure you don't overmodulate the audio into the camera. The Sony takes only mic level signal.