The term "collection" is used by DAM websites to describe collections of items that have been marked for subsequent access by a public user. While being referred to as a "collection" in this context, a root-level container in Odyssey is not the same thing.
If the account has the Digital Asset Management feature enabled, the page loads when you access it (for example, by clicking the "View" button from within the DAM editing controls or the add button); otherwise, the page redirects to the first public site that is available in the account.
You are forwarded to the collection index on page load if you are already logged into the DAM site (regardless of your Odyssey login status). Otherwise, the login page is displayed to you. Every parameter for website setup is implemented as described in the admin controls.
Click on the "Add Digital Manager (DAM) site to start a new site.
Add Page for DAM