I just tried a couple of different attachments and I’m not able to include a screenshot either.
@DC: you can try uploading the image to some other public site and linking it, for now. It might be that ANet disabled attachments for some reason or that something is borked server side.
I’ll report the issue as well. Hopefully someone can take a look.
Uploaded this for Diva. Here are the images she wished to share.
http://imgur.com/a/eVhq2