1. A method comprising: receiving, by a processor of a content management system, a first message from a collaboration system, the first message including document metadata corresponding to a document generated by the collaboration system; storing, in the content management system by the processor, a first reference to the document in the collaboration system; in response to receiving the first message, saving, in the content management system by the processor, the document metadata received in the first message as metadata for the first reference; and synchronizing, by the processor of the content management system, the first reference metadata with a first client device.