>>I noticed that in the WebuzoVH.con file, there is an include file that contains directives such as location /
Sir, please do not change/modify the WebuzoVH.con file from /usr/local/apps/nginx/etc/conf.d/ directory as this file contains important webserver configuration and it gets rebuilt, so the changes done by you will be reverted to the default conf.
If you want to add a custom configuration, you can refer to the guide:
https://webuzo.com/docs/developers/custom-virtualhost-config/