One way (if still available) is to upload it to moates.net and then point folks from here to there with a link. It's kind of buried, but last I knew you could still upload files there.
Alternatively, you could probably take a screenshot, upload it to the picture album here on CK5, then put that image in an email here.
I don't know how to upload a non-picture file here unfortunately, if it's even possible.