I figured it out. There needs to be “root motion” in the animations you retargeted to your custom model; otherwise, there’s nothing for the “Graph Mode” to use to predict direction.
With the root motion present in the animation, the Graph Mode can read the direction that the root bone is traveling and then it can warp the orientation of the animations.
Here’s a video explaining Graph Mode: https://youtu.be/dij2OfgUXsc?si=v3hSlErqA8jYbnK3&t=1109
You will have to retarget each animation correctly in order to get the missing root motion. Here’s a how to video: https://youtu.be/joFpm3ZDcd8?si=eMdTZUlC76T3ZnIm
Basically, before you retarget, you have to click on the Root chain (highlighted in picture below):
Once you click on the Root chain, you’ll get a mini-menu that pop’s up saying Root Settings. When you get to the Translation Mode portion as seen below, you can choose Globaly Scaled or Absolute. The point is to move the Translation information over to the Target Skeleton so that it can use it in it’s animations.

