This feature, along with Portal Pages, Channels, and non-SAIL interfaces, has been deprecated and will be removed in a future release of Appian.
See Support for Application Portal and non-SAIL forms for more information.
Use Knowledge Centers instead of Communities. Knowledge Centers can now be set as the top-level container for document heirarchies.
For information about the Modify Community Security Smart Service [Deprecated], see the Appian 16.2 documentation.