If I'm using "Matte Layer 1" as a Track Matte for "Fill Layer 3", and then apply a Track Matte to "Matte Layer 1", it has no effect. Her's an example...I want to isolate the thumb:
![hellopaul4_0-1715242689016.png hellopaul4_0-1715242689016.png](https://community.adobe.com/t5/image/serverpage/image-id/692040i071D3F74FBB9084C/image-size/medium/is-moderation-mode/true?v=v2&px=400)
If I set the "Hand" layer's track matte to layer 2, I get this...all good so far:
![hellopaul4_1-1715242754955.png hellopaul4_1-1715242754955.png](https://community.adobe.com/t5/image/serverpage/image-id/692041i4AD2FF7DFAE1B065/image-size/medium/is-moderation-mode/true?v=v2&px=400)
...now I want to isolate that thumb, so I set Layer 2 (the hand matte) to use Layer 1 (the rough thumb matte) as a track matte:
![hellopaul4_2-1715242807484.png hellopaul4_2-1715242807484.png](https://community.adobe.com/t5/image/serverpage/image-id/692042iD218BF48AEE954BB/image-size/medium/is-moderation-mode/true?v=v2&px=400)
...not the desired result. Obviously I Layer 2 should use the matte of Layer 1, but it doesn't.