I am really sorry for the late reply to your question !
If you are using a Dynamic List Wrapper outside of a Collection Template page, it will display the other collection fields, but not the multi-item reference.
You can display the collection that a multi-item reference is based on, but the displayed items are not linked to the items in the other collection used in the multi-item reference.
You can add a Dynamic List Wrapper into a Collection Template page, and there you can display a listing of the multi-item reference field items.
For example, on the Collection Template page, could have the Blog post title, and then add a dynamic list wrapper using the multi-item reference field in the collection, to present a list of categories that are referenced to the blog post.
Does that help?