fairly simple thing.Yet,it eluded me.
Thing is,i often do bridge,or connect,even weld.
But here it doesn't work.
What i want is to connect this "arm" to the upper part,i've already cut through there to mark the edges i want to connect to.
I want to know on what logic does these tools work,and what causes the edges to be (non)connectable?
edit:,figured it out.
i deleted 2 side faces and then edges connected.