Runpod S3 multipart upload error

When I use boto3.client.upload_file for a multipart upload, all parts are successfully uploaded to S3, but I encounter an error: "An error occurred (InternalError) when calling the CompleteMultipartUpload operation (reached max retries: 10): Failed to create final object file".
File size is 2.1GB and storage space(20GB) && part sizes(200~300MB) are within limits.
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