Originally posted by Thomas
The process should be like this:
1) Be in Layer 1 editing mode
2) Select the first pipe tile.
. Nothing should visibly happen.
4) Select the second pipe tile.
again. A popup should appear this time.
6) In that popup, choose two different (ideally unused, i.e. "invalid map") settings. These are the indexes the two pipe tiles will be registered to.
7) Hit okay. The pipes should now be linked.
this worked, I didn't know it was that easy. thank you