animations of character doesn't work

my name is thijs and i always wanted to create a flash game. I can not model yet so i downloaded this model:
but when i set it into ue4 the animations won’t work and i did code it correctly. they won’t even import well.
i just started using ue4 and i would really appreciate it if somebody could help me out!

I didn’t want to create an account so I couldn’t dwnld it… but where is your root bone located… mixamo has its root in hips and the armature has to be renamed to root… import it into blender to check if it works there… it could be that the fbx is an fbx unreal doesn’t use…