How do I add a Zigbee device to the Tuya Smart app?

You must add a Zigbee gateway before adding any Zigbee devices. Power on the gateway, connect it to a router using a network cable, and ensure your mobile phone is on the same LAN connected to a 2.4 GHz Wi-Fi network. Once the gateway is added, go to the gateway page, tap Add Subdevice, and follow the same steps used for adding Wi-Fi or Bluetooth devices. (Pages 33-35)