Go to the cli and type #map in CleanFlight.
Here is my mapping: Current assignment: TAER1234
What it means: Throttle, Aileron, Elevator, Rudder, Aux1, Aux2, Aux3, Aux4
Aux is mapped like this: Throttle, Aileron, Elevator, Rudder,Channel5, Channel6, Channel7, Channel8
I had to add a mixer...