I migrated with a project from Bitbucket to Github and I can not find a way to attach a file to an issue (ex: screenshot, specs, etc)
How to do it?
OK, here's what I use for screenshots.
http://www.techsmith.com/jing.html
It's free, fast, automatically uploads the image and pastes a URL link to your clipboard which you can Ctrl-V into the GitHub issue instantly.
It was a big sigh of relief when I discovered this :)