This issue is littile complicate or i am totally doing some thing wrong . i have downloaded one sample animation from mixamo as bvh and i have also followed all the steps over here  Animation works well . But i needed some tweak in hand position  and some leg movement ..i did them in blender and blender plays well after that  i again exported the animation and just everything doomed .  dont know what i am doing wrong . tried with other animation from mixamo works well , bu