Host Subdirectory via Nginx

Hey Guys!

This might be the wrong place to ask for help, since this is a nginx-server issue that has nothing to do with the nginx-plugin but maybe there are some nginx-pros around that cna help me

Today i tried to create a subdirectory with an index.php file that i want to host via the running nginx server

I tried the following:
cd /var/www/openmediavault
mkdir transfer
chown www-data transfer
cd transfer
nano index.php (wrote php code)
chmod 664 index.php

then i changed the config file in /etc/nginx/sites-available
nano /etc/nginx/sites-available/openmediavault-webgui

and added the following lines:

location /transfer {
        root /var/www/openmediavault/transfer;
        index index.php;
    location ~ \.php(?|$) {
        include /etc/nginx/fastcgi_params;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_pass 127.0.0.1:9000;
    }
}

then i restarted the nginx service:
service nginx restart

now when wanna access the site i get a 404 Error:

Error 404
Sorry, the page you requested was not found.

I'm desperate for help!!!

Thanks a lot in advance