How to process a PDF to the Writer API?

Hello :)

Does anyone have experience in processing an invoked PDF to the Zoho Writer API?

In Deluge I requested a PDF estimate from Zoho Books

downloadedEstimate = invokeurl
[
url :"https://books.zoho.eu/api/v3/estimates/pdf?organization_id={ORG-ID}&estimate_ids={ESTIMATE-ID}"
type :GET
connection:"flow_subscription_books_connection"
];
downloadedEstimate.setFileType("pdf");

This works fine.

After this I want to inject the PDF to the Combine PDFs job from the Zoho Writer API:

Zoho Writer API returns the response

"error": {
"message": "There was a problem combining the pdfs. Please try again in a while.",
"response_generated_time": 1666262495187,
"documentation_url": "https://www.zoho.eu/writer/help/api/v1/combine-pdfs-possible-errors.html",
"request_url": "https://zohoapis.eu/writer/api/v1/documents/pdf/combine",
"errorcode": "R7500"
}

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