Footage folder has a black/white and full channel

Sometimes I get footages like this within a download folder.
How do I use the Alpha footage?

Screenshot 2022-12-05 at 1.42.04 PM

Cut the clip half way through, place the black and white clip on top of the colour clip and set the colour clip to use the luma value of the black and white clip as a matte. Varies how you do that depending on the software, but that’s the general gist.

Thank you so much!

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