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An AM-file that is connected to a private container AND is connected to one or more non private containers, will be visible to the users who has access to the non private containers.
To create a private container as top-level agency user, click the "Containers" button:
Note that the "Private" column will only be visible to a top-level agency user. 
Click the "New" button, fill in the details and check the "Private" checkbox.
