I can't honestly say that I recognised a delineation between TinyMCE and the rest of the editor. I thought it was all the same thing.
But it is a bit odd, if you look at my reply to Mr Wix of this parish, there where I've quoted his post the link and ascription are given, but where I've quoted dear ol' auntie Beeb they're missing.
didn't the old way used to have a place there ready to just drop a C&P URL into?
á lá ~ quote src="" url=""
ohhhh, maybe it's all WYSIWYG now... uh, can't see a way to stop that...