Help with Bulk V2 API Wrong content-type

Can I get some help, I'm having trouble getting Bulk V2 API to accept csv data:  

Below is the final portions of my script (python): 

1. I successfully login and authenticate (so have the instance_url) 

2. Then, I compile/gather csv data: csv_data = df.to_csv(index=False)  #-- from a pandas dataframe 

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From here, this is what is run:  

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    bulk_api_v2_url = f"{instance_url}/services/data/v62.0/jobs/ingest/" 

    headers = { 

        "Authorization": f"Bearer {access_token}", 

        "Content-Type": "application/json", 

    } 

    # Create a job 

    job_data = { 

        "object": "Account", 

        "operation": "update", 

        "contentType": "CSV", 

    } 

    response = requests.post(bulk_api_v2_url, headers=headers, json=job_data) 

    job_id = response.json()["id"] 

    upload_url = f"{instance_url}/services/data/v62.0/jobs/ingest/{job_id}/batches/" 

    files = {"file": ("data.csv", csv_data)} 

    response = requests.put(upload_url, headers=headers, files=files) 

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Here is a typical response:  

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[{'errorCode': 'BULK_API_ERROR', 'message': 'Wrong content-type for batch (application/json), job is of type: text/csv'}] 

I also tried this, with the same message:  

  response = requests.put(upload_url, data=csv_data, headers=headers) 

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1. I have tried adjusting the header  "Content-Type" to "text/csv" - but this fails, even in Postman  

2. Also tried converting the job-data to json, but the API doesn't seem to support this:  

  -

Is there a way to adjust the content type of the batch?  

Other suggestions?  

Thanks ahead of time...  

Jarrell