Bone Rotation Animation

1. Switch to animation mode

Auto Keyframe

1. Turn on the auto keyframe button in the timeline panel's left toolbar.
2. Move the playhead to where you want to add a keyframe.
3. Select a bone and modify its rotation.
4. Keyframes will automatically appear on the timeline.
5. Drag the playhead with the mouse to observe the animation.

Manual Keyframe

1. Turn off the auto keyframe button in the timeline panel's left toolbar.
2. Move the playhead to where you want to add a keyframe.
3. Select a bone and modify its rotation.
4. In the property panel, the flag icon next to the rotation property turns yellow. Click this flag button to manually add a keyframe.
5. The flag turns blue, indicating there is a keyframe at the current playhead position.
6. Drag the playhead with the mouse to observe the animation.

Rotation Animation Transition

1. Between two rotation keyframes, the direction of animation rotation always follows the smaller angle path.
2. If you want to rotate in a specific direction (clockwise or counterclockwise), you can select this option in the rotation property.

Animation Rotating More Than One Turn

1. If you want a bone to rotate a full circle, one method is to add several keyframes.
2. Another method is to select "x1" in the rotation property, which means one full rotation. "x2" means two full rotations.