Assigning a autotune switch in a R.C transmitter

1

How do we assign autotune switch for taranis x9d plus transmitter ?

2

For fixedwing it is here: Auto-tuning | PX4 User Guide (main)

Not sure if multicopter auto-tune supports it.

I’m pinging @bresch to find out.

3

Was this feature removed from multicopter?

4

Auto-tune exists for multirotors but the mapping to enable it using an RC switch was only implemented for fixed-wings. For multirotors, you need to use the GUI (autotune button in the tuning tab) or set the parameter MC_AT_START to 1.