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It's common knowledge the S10 has removed the LED feature.
What's wrong with using a third party app?
I don't have an S10, so can't answer the actual question, but know that there are solutions out there. Therefore wondering why you are excluding them?
Is it? first time I've seen of it.
Probably not, which explains the rise in 3rd party apps that do this.
One of the best of them is here...