Everything works fine until I get to the part where I post to the upload URL that is returned to me. Then, I receive the error: "SignatureDoesNotMatch:The request signature we calculated does not match the signature you provided. Check your key and signing method." What could be going on? I am using ColdFusion, *NOT* PHP. CF and/or plain English responses will suffice. It is worth noting that if I pass in the Basic auth in the header here, I get the error: "InvalidArgument: Only one auth mechanism allowed; only the X-Amz-Algorithm query parameter, Signature query string parameter or the Authorization header should be specified" I assume the upload URL already contains my auth? Why would it return SignatureDoesNotMatch though? Has anyone successfully went through the entire process with ColdFusion? PHP is not an option available to me. Company does not use it.