How to adjust soldier/AI animations?

[turtleneckflex]

Hello, after importing a new soldier and AI model. the animations seem to be a bit off. (ex: Soldiers head is tilted at awkward angle)
I'm trying to adjust the Animations so they look better.

When I go to the animations, they are all listed as "Read-Only" making it impossible to change any of the keyframes.
I've tried duplicating the WalkAim animation and replacing it in the Animator so it does not say read only and displays the keyframes.
Unfortunately this did not work and when I press Record and try to adjust one of the keyframes the body part seems to snap back in place. (see vid)

Also wondering if there's a way I can import animations from https://www.mixamo.com/
I like using this site because they look a lot better than what I can do and take up less time

video link: https://streamable.com/mo5pvz

[Lovatto]

That is not caused by MFPS, it's a problem with your animation skeleton pose, mecanim use skeleton to retargeting the humanoid animations in different models rigs, this deviation in some animation bones is caused because of the default skeleton TPose.

The easy solution for this is to modify the skeleton, check this video:

[turtleneckflex]

thank you