How can I to replace a sticker with another sticker?

hello,
i having trouble getting sticker replaced sticker. sticker want replaced plain white sticker attached on object while object rotating in space. have created alpha channel mask layer , placed under raw video. afterwards applied luma matte on alpha matte channel layer. this.

does have resolution problem?

the matte source goes on top, layer want masked goes below. if using black , white image need use luma matte because image has no alpha channel.  depending on how created black , white image may need pre-compose matte layer make work.

 

to learn more type track matte in search field @ top right corner of ae , study files , community resources. yours not working because of improper workflow, there no bug.

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