Get file contents off a file upload field

I have been struggling with getting uploaded file contents in ZOHO CRM using DELUGE.

I have a custom module that has a file upload field were users should upload an XML file

I have been able to retrieve the URL of the file but not the contents. There seems to be no way to get it directly so I have been trying to download the file again via API

if(factura.get("Archivo_XML")!=null)
{
file = factura.get("Archivo_XML");
info file;
url = file.toCollection().get("download_Url");
url = "https://crm.zoho.com" + url;
info url;
// to fetch file from the cloud using invokeUrl task
fileVariable = invokeUrl
[
url: url
type: GET
connection : "zoho_crm"
];
// to fetch the file content
response = fileVariable.getFileContent();
info response;
}

I can get the file with that URL just fine, but when I inspect fileVariable, I see that it's getting https://crm.zoho.com as a non authenticated user.

What do I have to send in addition to what I send already to be able to get the XML data?

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