Forget it, I tried different options, but it doesn't work... Maybe I'm making a mistake somewhere in the tutorial, maybe there's some nuance, maybe, I don't know what else, but I'm tired of messing around with this export...
Using Granny Viewer, you can see that the number of bones in the animation skeleton and the T-pose skeleton are different -
К. Прутков-инженер. Мысль № 77.
Многие вещи нам непонятны не потому, что наши понятия слабы; но потому, что сии вещи не входят в круг наших понятий.
© Козьма Прутков