Blender model to Unity not working

I have a model with textures and a couple animations; downloaded online; but when i export from blender and put the fbx in unity; the head textures are missing and one of the animations is jerky. The only changes i made to model to export is fixing the transforms. as per a tutorial which works, but could never fix the head or animation.

Any ideas?

9546847--1348741--Screenshot 2023-12-24 212119.png


error here