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In the Authorization tab select TypeAWS Signature” and enter your AccessKey and SecretKey, which you get when you create an S3 token in Content Portal. Under Advanced you must enter “s3” (lowercase S3 or you will get a 403 SignatureDoesNotMatch!) for the Service Name.

In the Body tab choose raw and choose XML in the Text dropdown. Enter a body like:

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You must also add the Key Content-MD5 with the value {{contentMD5}} (that is Postman variable syntax) in the Headers tab. With recent Postman 10.21.0 it seems this reports to report contentMD5 is an Unresolved Variable but V4 signature signatures still works work, probably because X-Amz-Content-Sha256 is used. The Unresolved Variable issue appears to be fixed by creating an account and signing into Postman and upgrading to v10.21.2.

Finally you must enter this in the Pre-request Script tab so that {{contentMD5}} variable is available:

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