services in CentOS e.g. nginx, php-fpm doesn't include symbolic link configuration files

I have 2 services in CentOS 7 - nginx - php-fpm

Those services have main configuration to include *.conf in certain directory.

However, it didn't read the symbolic link file in that certain directory.

Please see screenshot for better clarification.

When i tried hard copy file to that certain directory, it's working.

Do you have any idea? is it because of centOS issue? Any configuration? The docs in php-fpm configuration saying that...

; Include one or more files. If glob(3) exists, it is used to include a bunch of
; files from a glob(3) pattern. This directive can be used everywhere in the
; file.

I'm not sure what does it mean by glob(3).

Please advise,