A hub is just Lua with a menu. Attach first, then load it.

If the hub UI never appears, you usually attached too early, the hub wants APIs listed on UNC, or that place is not in the hub’s table. Do not stack three hubs in one session.

Attach successfully with a one-line print test if you have one.
Paste a single hub. Wait. Read the output pane.
If one game tab errors, that is often the hub, not the runner.