Retargeting the Samaritan Matinee Fight Character

So in my attempt to re-target the Samaritan character from the matinee fight scene with the animation starter pack.
Things didn’t go as planned. But i was able to edit the A pose into a T pose and then do the ‘Duplicate Anim Asset and Retarget’ for an idle pistol animation.

The problem is the end result has several errors and deforms. I can correct them by rotating and moving the skeleton into the right place.
For example the shoulder/arm and legs.

when i do rotate and correct the skeleton. The animation plays and works beautifully.
The only problem is that it doesn’t save. There is no way to save the edited animation.
When I close and re-open, everything is back to its deformed form.

Would love to know what i’m doing wrong.