You can refer to the guide below to enable the UID for your camera or NVR. 

Applies to: All Reolink cameras/NVRs (exclude Reolink Battery-powered cameras, Reolink E1, Reolink E1 Pro, Reolink Lumus, and the cameras in the NVR Kit).

Step 1. Log in to your camera via a web browser. log-in-on-IE-browser.png

Step 2. Click the gear icon on the top right to get to the device settings page.Click_settings_icon_web.png

Step 3. Click Network > Advanced. Toggle the switch to enable UID. enable_UID_web.png

If your camera or NVR is with an old user interface, you can refer to the steps below. 

Step 1. Log in to your camera via a web browser and go to the device settings page. 

Step 2. Go to Network > Advanced. Check UID enable to enable the setting.