Hi.
I don’t usually post because I don’t speak English.
But I will share my recent experience.
I had the same problem, so I removed the bottom cover and disassembled 2 motor parts.
I found that the puller on the end of the motor was loose and came off easily.
So I found that the motor rotates but the gear doesn’t.
I fixed the problem by using a small piece of cloth to hold the puller in place to engage the motor.
I don’t know if it’s the right way, but it works fine.