Comment 3 for bug 137842

I would say it is similar, but not a dupe.

bug #32772 "add atachment" a file from a URL
is just an alternative to "add attachment" from local file - both store a copy of the file on the but tracking server.

This bug seems to be more a pointer to another bug. Not sure why the implementation concerns "add attachment" - just post the URL in the body or comment, - it gets turned into a link at some point, which seems to be all this bug is trying to achieve.