New API for invoice attachments error : Received multiple request parts. Please only supply zero or one `parts` of type application/json

I keep getting the following error:
*** square.core.api_error.ApiError: status_code: 400, body: {'errors': [{'category': 'INVALID_REQUEST_ERROR', 'code': 'INVALID_CONTENT_TYPE', 'detail': 'Received multiple request parts. Please only supply zero or one `parts` of type application/json.'}]}

It does not make sense that the API response focuses on an “application/JSON” type request when the parameters to the API method are supplied are a file path (stream or text path) and request dict as the docs require.

when I try to upload an approx ~800 byte jpeg [very grainy] in the development sandbox for Square Invoice API using the following code:

        try:
            # I have tried using a stream as well, still the same error
            # f_stream = open(pdf_filepath, "rb")
            invoice_pdf = SQUARE_CLIENT.invoices.create_invoice_attachment(
                invoice_id=self.square_original_invoice.id,
                # image_file=f_stream, <- this also does not work
                # file=pdf_filepath, <- also gives error InvoicesClient.create_invoice_attachment() got an unexpected keyword argument 'file'
                image_file=pdf_filepath,
                # pdf_filepath = 'local/path/to/file.jpg'
                request={
                    "description": f"Invoice-{pdf_filepath}",
                    "idempotency_key": idem_key,
                },
            )
        except ApiError as e:
            print(f"ERROR _attach_pdf_to_vendor_payment with errors {e}")

In the sandbox API, I get the 400 Response error:

// cache-control: no-cache
// content-type: application/json
// date: Wed, 30 Apr 2025 13:35:06 GMT
// square-version: 2025-04-16

{
  "errors": [
    {
      "code": "BAD_REQUEST",
      "detail": "Total size of all attachments exceeds Sandbox limit: 1000 bytes",
      "category": "INVALID_REQUEST_ERROR"
    }
  ]
}

This worked fine in the old pre 42 API, with minor syntax change, and I know the limit is now imposed to have a 1000 byte limit for the attachment, but why can’t I upload attachments in the sandbox now?

Stack overflow link : python - Square API for invoice attachments 'Received multiple request parts. Please only supply zero or one `parts` of type application/json.' - Stack Overflow

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