I don't believe this is possible as of Yosemite 10.10.5. The sharing menu would be a sensible place for this, but it doesn't have an option to send or copy a link to the file, choosing Mail or Messages will attach the full file:
I don't believe this is possible as of Yosemite 10.10.5. The sharing menu would be a sensible place for this, but it doesn't have an option to send or copy a link to the file, choosing Mail or Messages will attach the full file: