The description reads like this mod would allow planet-to-planet belt transfers.
However, I go to Vulcanus, build several linked-belt-undergrounds, and set one down. When I set another one down on the same surface, it links it with a nice visible line, and auto-rotates the "destination" underground to correctly be "output".
When I try to remotely place the output/second-underground-belt on Nauvis, it is facing the wrong way (be an input), and doesn't link to the first.
Does this mod allow planet-to-planet belting, and if so, how?