Review on 📡 HiLetgo UNO R3 WiFi ATmega328P + ESP8266 NodeMCU 32MB Memory USB-TTL CH340G for Arduino | Includes USB Cable & 2.4G WiFi Antenna by Joe Comforti

First of all it's difficult to find any manuals or useful data on the subject. It seems that others had difficulty communicating with him. There are a few tiny DIP switches that you need to set between uploading to the UNO part and the ESP part, which require different baud rates. The search for suitable libraries is also difficult. There are a large number of "example" sketches, none of which actually work, including Arduino's own libraries, and while this requires a firmware update, it's entirely impossible. The two modules do not exchange data. It probably makes sense to use separate devices.