Hi @pfarrell! Thanks for writing in!
If you create a mock server from scratch i.e without an existing collection, you create requests and responses in the mock creation workflow. A corresponding collection is created for you and the mock server runs on top of this collection. You can edit the examples associated with the requests in this collection and this reflects in the mock server.
On the other hand, if you create a mock server on an existing collection, you can directly change the examples in the collection and it is reflected in the mock server.
To summarise, the mock server is always created on top of a collection and whatever changes you make to collection (request, headers, body, response/examples, etc) are automatically reflected in the mock server.
I hope this clarifies your query. Please let us know if you need more info