Htaccess 301 redirect from one directory to its subdirectory and keeping the main directory url accesible

I am trying to redirect all pages coming under

• /directory/any-page

to

• /directory/supplier/any-page/

and what to keep the directory url accessible as the directory url also contain content which I need to display and i used this htaccess code

RewriteRule  ^/directory/(.*)$ /directory/supplier/$1 [L,R=301,NC]

but it's not working.

via Chebli Mohamed