Here’s how to add an external folder eg. (a folder that is not part of your web root /var/www). Let’s say you want to publish a data folder that is inside of your home directory. For this you would create an alias in your “default” file under “VirtualHost” section.
1- using your preferred editor open /etc/apache2/site-available/default
2- Under “VirtualHost” section add
Alias /data "/home/user/data" <Directory "/home/user/data"> Order allow,deny Allow from all </Directory>
3- Restart apache:
sudo /etc/init.d/apache2 restart
4- place a test html page in your data folder and access through browser