after switch to poshold mode and turn ch8 autotune to max but autotune notstart
my setting
AUTOTUNE_AGGR 0.05
RC_FEEL_RP 20
RC1 2 3 4_DZ 50
THR_DZ 100
Throttle has to be centred to start.
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still not work 
Maybe a log would help identify the problem.
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Thank. I think I found, Before 3.5.2 firmware support autotune with PosHold
But i have promble and downgrade to 3.4.6 and try to autotune in PosHold…
I just try tomorrow in Atlhold mode.
That would do it.Position hold autotune first appeared in 3.5.x.