File Upload Detect is great but I found 2 bugs with Version 2.1a19 (https://github.com/vanillaforums/Garden):
It only works when I comment to a discussion, and doesn't work when I start a new discussion.
If I attach an image when writting a new discussion, I can see the image at the bottom, but I can't find it after I post the discussion.
When I attach image in a comment, I can't find it after I post the comment. I can only find it after refreshing the page.
If the addon is installed on vanilla-core-2-0-18-4, it don't have the same problems.