Adding attachments to Issues via external URL

[Jeremy Black]

I have some attachments to add to a ticket that are of an external nature.  For example, i want to attach an image or video but i will only have a URL to send to the API.  How can i send it via a POST operation?

[Eric.Vieceli]

This is an old question but yes, I'd like a solution to this as well.  One would think that within 6 years of this being asked that it would had been answered at some level.