It doesn't look like there is within the Conversations (Inbox) tool. The best place to ask for help is your local IT or Canvas support team. They might be able to work with the Instructure support team for your instance of Canvas. It would be great if their vigilance extended to the Canvas Question Forum, alas it does not.

I’m going to mark this reply as a solution. I realize it does not solve your problem, but others with a similar challenge will find the best way to ask for help.