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When you import the .fbx the animations should come with. Do you mean how to set them up or use animations in Unity?

I added the FBX model to Unity, but the animations do not work

After adding the animation controller with the variable Velocity, I switch animations when we reach the given speed. The idle animation works during the start and then stops

Here I add a few screens from Unity:

https://imgur.com/a/WrS6q0r

https://imgur.com/a/RZVahqV

https://imgur.com/a/Iq7b8rn

https://imgur.com/a/j1Eltu0

https://imgur.com/a/fI64gou

https://imgur.com/a/Q2smY4h

Ok, so for starters only use the idle and walk animations. I'm not sure what the others are, as far as the idle only playing once that most likely means you didn't set it to looping.