I realize this is a very old thread, but nevertheless …
I’m trying to attach a cable to two actors, each with a connector. I spawn the cable when hovering over the first connector. When I click, the cable actor gets the same world location as that connector (it’s start point). I wish then to set the end point to my mouse cursor (with a trace), so I can freely move the end point of the cable towards the second connector, and then attach it. But since the end point of a cable cannot be set with bluepints, that’s not an option I’m afraid …