Error while trying backup to S3

Try to backup to S3-compatible protocol and recieeve this error message:

x-amz-content-sha256 must be UNSIGNED-PAYLOAD, STREAMING-AWS4-HMAC-SHA256-PAYLOAD, or a valid sha256 value.

Technical support reported that at the moment they do not support streaming. What can I do to use this connection?

Not sure what works there, but my best guess is to set --s3-ext-signatureversion=2 and see if that works.

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