Applies to: all Reolink cameras and NVR( cameras in the NVR kit doesn't come with UID).
Step 1: Log in the camera/NVR and go to Network -> Others Setting:
Step 2. You may change the settings as you need and click Save to save the settings.
Note: the UPnP needs the router supports, also, you may try to reboot the router and camera when it doesn't work.