Multisite for demos

Hi guys,

Im wondering here how am I going to set up new sites in form of :
https://demo.domain.com/test1, https://demo.domain.com/test2, https://demo.domain.com/test3 etc ?

I have set up the network, which is ready and I also have in the config file this:

define('WP_ALLOW_MULTISITE', true);

define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', false);
define('DOMAIN_CURRENT_SITE', 'demo.domain.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

And in the .htaccess I have this :

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

I have also created a subdomain in cPanel having it pointing at a new folder called /demo
Should this subdomain be pointing at the root maybe?

Currently Im not being able to see the newly created sites.

In the DNS zone those records has been created:

demo.domain.com. 14400 IN A “IP number”

https://www.demo.domain.com. 14400 IN A “IP number”

Important to mention that I do get this when entering : demo.domain.com on the browser:

Index of /demo

Parent Directory
cgi-bin/

Anything I have done wrong and Im still not able to see the new sites?