Yes. After a device connects to the same network as the control panel, the control panel can control the device without an uplink network. In this scenario, the control panel reads device data from cached files to load the device. (If a device is added, the device cannot be synchronized to the control panel because Tuya Cloud is inaccessible.)
Note: The prerequisite is that the control panel is connected to the network for a period of time to initialize LAN control. (After the control panel restarts, LAN control does not need to be reinitialized.)