Issue Updated Webhook event is not triggered when an attachment is added to the Issue.

[Aman Agarwal]

Whenever i add an attachment directly to the issue, no webhook event is triggered. 

I have the following webhook events added:

issue_created

issue_updated

comment_created

comment_updated

Also when i add an attachment to a comment, the body in comment_created payload doesn't have any information about the attachment. What am i missing here?