Download the file named GCam_Config81_2021_Final.xml from a trusted source (CelsoAzevedo’s repository or the XDA thread for your device). unless you know the exact syntax.
GCam Config 81 (2021) – Boost Your Smartphone Camera Quality gcam config 81 2021
On some GCam ports, the folder may be named Configs or Configs7 —check your specific port's instructions. Some users have also reported success using the /Download/MGC.8.1.101_Configs path, depending on the port. Download the file named GCam_Config81_2021_Final