How to store extention on AWS S3?

Hello!
I’ve stored my custom extension on https://s3.amazonaws.com/my-app/webtask.json
When I’m trying to add it to my extensions in auth0 admin panel, I getting an error “The webtask.json is not a valid JSON. Fix and try again.” But if I put my extension to github everything is ok.
Is it possible to store extensions on S3?

Thanks.

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