docs: private AWSCredentials resolveCredentials(PutMediaRequest request) {
          AWSCredentialsProvider resolvedProvider = CredentialUtils.getCredentialsProvider(request, credentialsProvider);
          AWSCredentials resolvedCredentials = resolvedProvider == null ? null : resolvedProvider.getCredentials();
          if (resolvedCredentials == null) {
              throw new SdkClientException(
                  "Credentials must be provided via the builder or present in the environment. " +
                  "See http://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/credentials.html");
          }
          return resolvedCredentials;
      }