The most recent addition to Rebus is a “data bus”, i.e. an implementation of the claim check pattern as described in The Good Book.
With the data bus, it has suddenly become extremely easy to transfer e.g. large CSV files from one endpoint to another, because the bus now supports creating attachments from streams, as well as opening up attachments as streams again in the receiving end.
Data bus attachments support including arbitrary metadata along with the attachment, allowing you to pass along file names, information about who made the attachment, etc.
You can read more about the feature on the official documentation wiki page.