This feature is currently in the testing phase

Typically used for animation modification of the upper body

Example:

Move the entire animation arm to the right

The control point of the arm is clavicle_ l and clavicle_ r

Create an AnimAddition asset and add two bone to it

Addition is relative curve of the Rotator, so adjust Y (Pitch) by using left and right for this time

Add Key clavicle_l(0,-10) clavicle_r(0,10)

Can be stacked multiple times, so smaller values can be used for fine-tuning

Apply

MaxFrametoAddation:The maximum added frame, for example, if adding the first 30 frames of the animation, set it to 30. Note that if you want to set this option, please ensure that the curve gradually weakens, otherwise the bones will look strange