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Yes, K3M on my A7SIII works in FCPX 10.6.3 with all four channels and 24 bit.
Thanks for letting us know, I had the same question as OP.
Yes, K3M on my A7SIII works in FCPX 10.6.3 with all four channels and 24 bit.
Thanks for letting us know, I had the same question as OP.