I followed a tutorial and selected the gun and clicked on flatten all motion with constraint, and then I selected the hands and used the reach target and made the gun their target.
Now I have created a simple animation, like the gun is shooting and the hands are following it. The problem is that I don't know how I'm going to export my character in a way that is going to have this animation made by the gun, because there are no keyframes for the character's hands, and only the gun has the keyframes.
The export format that I'm talking about is FBX.


How do I export this animation created by reach targets?

Tutorial:
https://youtu.be/p1pE5zX1OM4