How to uploade the .gzip file to Swift Object Store?

I wrote the Python code to upload the .gz file from my local machine to the OpenStack object store using the following documentation: https://docs.openstack.org/python-swiftclient/latest/client-api.html.
Below is the code I wrote.

from keystoneauth1 import session
    from keystoneauth1.identity import v3
    from swiftclient.client import Connection, logger
    from swiftclient.client import ClientException
    import gzip

    # Create a password auth plugin
    auth = v3.Password(
        auth_url='https://cloud.company.com:5000/v3/',
        username='myaccount',
        password='mypassword',
        user_domain_name='Default',
        project_name='myproject',
        project_domain_name='Default'
    )

    # Create swiftclient Connection
    swift_conn = Connection(session=keystone_session)

    # Create a new container
    container = 'object-backups'
    swift_conn.put_container(container)
    res_headers, containers = swift_conn.get_account()
    if container in containers:
        print("The container " + container + " was created!")

    # Create a new object with the contents of Netbox database backup
    with gzip.open('/var/backup/netbox_backups/netbox_2024-03-16.psql.gz', 'rb') as f:
        # Read the contents...
        file_gz_content = f.read()

        # Upload the returned contents to the Swift Object Storage container
        swift_conn.put_object(
            container,
            "object_netbox_2024-06-16.psql.gz",
            contents=file_gz_content,
            content_type='application/gzip'
        )

    # Confirm the presence of the object holding the Netbox database backup
    obj1 = 'object_netbox_2024-06-16.psql.gz'
    container = 'object-backups'
    try:
        resp_headers = swift_conn.head_object(container, obj1)
        print("The object " + obj1 + " was successfully created")
    except ClientException as e:
        if e.http_status == '404':
            print("The object " + obj1 + " was not found!")
        else:
            print("An error occurred checking for the existence of the object " + obj1)

The file gets uploaded successfully. However, if I download the file from the object store and try to decompress it, I get the following error:

# gzip -d object_netbox_2024-06-16.psql.gz 

gzip: sanbox_nb01_netbox_2024-06-16.psql.gz: not in gzip format

What should I do to ensure the file gets downloaded in the same format and size to the Object storage as the file in my local machine?

Any assistance will be appreciated.

Yours sincerely