Thanks Jici for your reply. The \n is not there that is coming from when I tested in Postman. But as required my backend API workflow is as follows: -

Now regarding where I am calling is a Javascript as follows: -

// Create a Blob from the RTF content
var blob = new Blob([fullRtfContent], { type: “application/rtf” });

// Create a FormData object to send the file
var formData = new FormData();
formData.append("file_url", blob, "document.rtf"); // Add the file to the FormData

// Send the file to the Bubble API
fetch("https://inconversationskz.com/version-test/career/api/1.1/wf/upload_file", {
    method: "POST",
    body: formData,
})

Thanks
Vijay Zutshi