The state of the download session.
ACTIVE : The session is active. Individual files may be in the process of being transferred and may become ready for download at different times.
CANCELED : The session has been canceled. On-going downloads may fail. The session will stay in this state until it is either deleted by the user or automatically cleaned up by the Content Library Service.
ERROR : Indicates there was an error during the session lifecycle.
Enumeration: ACTIVE, CANCELED, ERROR,