diff --git a/src/frostfs_testlib/s3/aws_cli_client.py b/src/frostfs_testlib/s3/aws_cli_client.py
index 470e7a32..e9811a59 100644
--- a/src/frostfs_testlib/s3/aws_cli_client.py
+++ b/src/frostfs_testlib/s3/aws_cli_client.py
@@ -729,7 +729,10 @@ class AwsCliClient(S3ClientWrapper):
             f"--key {key}  --upload-id {upload_id} --multipart-upload file://{file_path} "
             f"--endpoint-url {self.s3gate_endpoint} --profile {self.profile}"
         )
-        self.local_shell.exec(cmd)
+        output = self.local_shell.exec(cmd).stdout
+        response = self._to_json(output)
+
+        return response
 
     @reporter.step("Put object lock configuration")
     def put_object_lock_configuration(self, bucket: str, configuration: dict) -> dict:
diff --git a/src/frostfs_testlib/s3/boto3_client.py b/src/frostfs_testlib/s3/boto3_client.py
index 46cfe4b9..f9b8b162 100644
--- a/src/frostfs_testlib/s3/boto3_client.py
+++ b/src/frostfs_testlib/s3/boto3_client.py
@@ -571,6 +571,8 @@ class Boto3ClientWrapper(S3ClientWrapper):
         )
         log_command_execution("S3 Complete multipart upload", response)
 
+        return response
+
     @reporter.step("Put object retention")
     @report_error
     def put_object_retention(