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Presigned URLs are useful because client app can upload/download directly from S3, saving the app server from this traffic. Does Row-Level Security achieve the same benefit?

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Yes, I agree! Although I should have specified that we support signed URL https://supabase.com/docs/reference/javascript/storage-from-... just not in the S3 protocol just yet :)

Thanks for confirming! Could you maybe update https://supabase.com/docs/guides/storage/s3/compatibility to include s3-esque presigning as a feature to track?

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