[tptacek]

No. In Slack, files and images posted to channels are content associated with the channel, not a private and opaque stream of bytes tunneled over another protocol between two specific channel members. The comparison between Slack and DCC is silly.

Given the problem of sharing a diagram with a team of developers on a group message channel, I'm sure there's someone here who would say they prefer the DCC option of receiving a named file and then opening it with a file viewer, rather than simply dragging the file into the chat window and having it appear instantly to everyone on the channel. The existence of that person is not interesting to me.