Unfortunately for me it was the kind of a thing that I didn't notice until I'd actually paid for a license and started using it. Then I tried to put my ssh public and private keys in there, and hit the wall.

It's such an obvious feature that would be so easy for them to implement, it made me feel like it must be possible and super-obvious to most people, but I was just too dumb to figure out how to do it.

(No, pressing shift-return in a single line text field doesn't work. And pasting multi-line text into a text field replaces newlines by spaces, thank you.)