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I find myself doing some complex manual masking people or needing to do a lot of adjustments to a tracking mask. As the person moves and the shape changes, the mask requires several additional points to make it fit. As the shape moves it may become simpler or smaller. I find I then have way too many points. But if I delete them I lose them back to the beginning of the clip. I just tried adding keyframes to all the parameters at the point that I want to start deleting them, but it still happened. What am I doing wrong? Do I need to set all the key frames and then move forward before deleting any?