New answers tagged discovery
I think the suggestion @denislees offers makes sense. Also, by way of another example, below is how reddit (who require a title, but text in the message body is optional) does it:
Add a discrete link in a secondary focus area (top right) This is how Gmail managed to remove the CC and BCC fields from their compose window. In your case it might look something like this: The location and wording communicate that this is not a critical element of the process, yet at the same time, if a user was to think "How can I add a ...
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