CentreStack is a managed file sync and share solution. When managed service provider use it to help clients to move local storage into cloud, they need to understand how the per-tenant storage is managed.
This video demonstrates how to setup a tenant (a client or an organization) and setup tenant storage.
There are two different kinds of storage on a per-tenant basis. One is the primary storage and one is secondary storage.
So basically it is a multi-tenant system, and with each tenant can map its own root folder storage and mount additional secondary storage with the end goal of sharing folders in those storage locations out to other team users.