Please ensure that you have granted the necessary permissions for the app, such as location, Bluetooth, and local network permissions, and that your phone is connected to a Wi-Fi network. (For wired devices, make sure your phone and the device are on the same router.)
If you are unable to find the device, please verify if the device is in pairing mode.
Even if the device is in pairing mode and still cannot be found, it may be because the device itself does not support this function. In this case, you can try adding the device manually.