Troubleshooting
The State Has No Effect
Check that the Character has a Humanoid Animator and that the State Clip is marked as Humanoid. Also check that the State's Blend Weight and body-part weights are above 0.
Aim Replaces Walk or Run
Remove the old weapon state and sight aim state. Set walk and run on the Character component, then use Motion Weave for the aim pose.
Reload Does Not Sit Above Aim
Use a higher First Overlay Layer for reload. For example, use layer 10 for aim and layer 11 for reload.
Stop Does Not Remove the Pose
Make sure the stop instruction uses the same Character and First Overlay Layer as the enter instruction.