Permissions needed for Cache folder

Seen in “Requirements”

“Writable permissions for the user executing PHP scripts on the NGINX cache folder”

I give 777 permission on NGINX cache folder, just for testing.
The user that creates that folder is “nginx”, which is not the same user with whith which the Plugin will run.

The Plugin cannot delete the NGINX cache as the permissions of the folders created INSIDE of NGINX cache folder has restrictive permissions, which deny the NGINX Cache Optimizer from deleting the folders and files.

How is this supposed to work if all folders are generated by NGINX with Nginx user with 700 permissions, that Optimizer cannot read/write with?

How do I move forward with this?

Found the NGINX User setting. Setting it to the same user as PHP user works fine.

nginx.conf
user phpuser;