The catalogue of CMS platforms IRIS Substation can talk to — global, shared by every tenant.
How this page works
This page defines what is available: Contentstack, AEM, Contentful. It holds no credentials. A tenant is wired to one of these through its own CMS Connections page, where the credentials and routing live. A system must exist here before any tenant can connect to it — the Overview says so if the catalogue is empty.
Connection required means the Substation refuses to serve the tenant until a connection to this system has been configured; turn it off only for systems that work without per-tenant credentials.