@Andy73 Hello, sorry to respond late. If you can add the other 3 NC200s successfully to the cloud, there should be no issue adding the 4th one, is the 4th camera also connected to the same wireless...

@Janusz Hi, sorry that there is still no ETA for the new firmware that supports the Smart Action, please keep an eye on your Tapo app for any future updates.

@Eirinouska Hi, If you cannot connect the camera to the wireless network, please refer to the below troubleshooting to check basic settings: https://www.tp-link.com/support/faq/800/ If still no luck,...

@smitd85 Hi, You may disable the Tapo app notification on your phone, Settings->Notification, then find the Tapo app and disable it.

@Jobitoys Hi, you may try to enable the Auto-reboot feature on the tpCamera app for the cameras and allow them to restart automatically at 03:00 AM.

@MarkyG Are they both connected to the same wireless network? You may try to swap the location of the two and confirm again if the issue occurs in the specific location or with the specific camera....