Other than screen recording, how can i record my iPhone screen?

I watch a lot of videos of people making aesthetic Instagram edits on their phones and they are able to record what they're doing on their phone screen but they don't actually use the screen recording feature (and I can see why. It makes everything move a billion times slower and half the time it doesn't even save the video) does anyone know how they do that? I've been trying to figure it out for ages

You can always download a screen recording-app

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