Do link conststraints work in Unity ? 3DS Max to Unity3d

Hey, I made a reload animation for a weapon and when I import it in Unity it doesn't move the hands. It rotates the fingers and the wrists but not the position of the hands themselves. I heard that fbx can't handle link constraints nor can unity import them. So my question is :

Is there any way to put my animation in game ?

I really don't wanna do everything from the beggining and have to move every single bone one by one...That would take a lot of time and would be a pain in the ass.

Thank you for your time!