9. The system of claim 7 , wherein the operations further comprise: receiving a request to download one of the one or more documents to one of the plurality of user devices; sending an indication to a synchronization client of a location for document storage; and receiving a message from the synchronization client indicating successful storage of the one of the one or more documents at the location.
9. The system of claim 7 , wherein the operations further comprise: receiving a request to download one of the one or more documents to one of the plurality of user devices; sending an indication to a synchronization client of a location for document storage; and receiving a message from the synchronization client indicating successful storage of the one of the one or more documents at the location. 10. The system of claim 9 , wherein the operations further comprise: in response to receiving the message, causing a database to indicate that the document one of the one or more documents is downloaded or present on the one of the plurality of user devices.