Oh wow, that first drawing is extremely accurate.
My I goes to L in Shelly.
That make sense but I tried to use only 1 cable from SW and split to Shelly/light and still get dim…
We don’t use N in switches, only in the fan/light that returns to main board.
In Switches we only use Line/Hot and the cable for the lamps/etc
I order 2 Shelly 1 Plus Mini and I still wonder if it’s not hardware issue. I’ll try once it arrives and let you know.
Does this make sense?
(Portugal)