If that's the case though, where would this popup be appearing from? (I haven't seen it, not quite sure where it would be) I would guess they wouldn't be aski

If that's the case though, where would this popup be appearing from? (I haven't seen it, not quite sure where it would be) I would guess they wouldn't be asking the sender to approve adding my multiple computers whenever I add one, since that would be a fairly crummy user experience. Seems like it should be something that I, the owner of the receiving devices, would approve or deny.