The tutorial is in French! and we just provide a part of the tutorial in ENG. For full content, please kindly visit https://getbrain.fr/gestion-vhost-nas-asustor/
"As you know the NAS Asustor based on an interface named to ADM management and complete configuration of the NAS.
However it does not allow the return of several VHOST ports using the same example:
However we want to set up a domain such as Owncloud of asustor service responds on https://owncloud.mondomaine.com that default responds with the url formed like this https://mondomaine.com/ownCloudEnterprice/ .
To do this we have to change the apache2 configuration by logging in via SSH on the NAS."