No, this camera does not support wifi connection. 

Yes, you can preview and shoot via the app on your phone. 

You can view photos and videos from this WiFi trail camera without removing it from the mount. And you can set the camera in the APP. This is very useful for cameras mounted in high places or hard-to-reach places. 

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. 

if your app is loaded onto your tablet, make user the tablet disconnects from your home wifi network - then look to connect your tablet to the SSID from the camera. (you may need to use Bluetooth, first - to connect to the camera, and turn on it's wifi). then, when your tablet can see the camera wifi SSID, connect to it. now the app on the tablet can control the camera.