In general, the subject matter described in this disclosure can be embodied in methods, systems, and program products for defining a navigation user interface that is to be presented by multiple client devices. A representation of the navigation user interface is presented. User input specifies a first collection of files that are to be accessible to users of the multiple client devices upon selection of a first element from the presentation of the navigation user interface. User input specifies a second collection of files that are to be accessible upon selection of a second element from the presentation of the navigation user interface. User input specifies multiple individuals to which the navigation user interface is to be displayed, and the navigation user interface is provided for display on devices assigned to the multiple individuals.