Creates an attachment under a content reference URL in the body or comment of an issue or pull request. Use the id and repository full_name of the content reference from the content_reference event to create an attachment.
The app must create a content attachment within six hours of the content reference URL being posted. See "Using content attachments" for details about content attachments.
You must use an installation access token to access this endpoint.
Scopes requested: user, public_repo, repo, notifications, gist
Authorization