6. The correction loop

The fill is a first draft. Repeat until the overlay looks right:

1. Fill.

2. Set the suggestion method to Lowest fill confidence and press Suggest frames. It brings forward the frames where the fill was least sure about any one keypoint.

3. Press N to go to the next one. Drag a wrong point to correct it; click a right one to accept it.

4. When a whole frame looks right, press Approve frame (Shift+H): every point on it becomes your label.

5. Fill again. Your labels and approvals stay put; only the gaps are recomputed.

The conf columns in the points table show the fill’s confidence per keypoint: 1 is a label, lower means less sure. For optical flow, the Disagreement tolerance (in pixels) sets how far the forward and backward tracks may differ before a point counts as unreliable. Raise it for large or fast animals.