Question Animation exporting problems, Help Wanted.

Im really new to blender, but i started learning to create assets to unity, So i created a small crossbow animation (Rigged and everything) and it works great on blender,but after exporting it in an FBX file i run into some problems.

1. The model breaks:
actually most objects stay intact but the "Strings" of the crossbow arent.

2. The animation isnt playing:
it says in unity that the animation is this there but it just wont play.


Ive been trying to fix it for over a week, it starts getting anoying, so i came for some help...
thanks.



If needed any more Images or something, il gladly add them.