Using xml file

I am building the Custom KYC WYSIWYA on the neuro-admin page. The goal is to be able to create a xml file and then send it to the neuron and convert it into an actual KYC. I have managed to create the xml, i can download it and as of now i just managed to send it to Agent/Storage/Content/vilgotdidrikson/KYCProcess.xml. But there i get a 403 error code that says the following:

The 403 (Forbidden) status code indicates that the server understood the request but refuses to authorize it. A server that wishes to make public why the request has been forbidden can describe that reason in the response payload (if any).

If authentication credentials were provided in the request, the server considers them insufficient to grant access. The client SHOULD NOT automatically repeat the request with the same credentials. The client MAY repeat the request with new or different credentials. However, a request might be forbidden for reasons unrelated to the credentials.

What i need help with is to send the created xml file from the frontend of the neuro-admin page to the neuron and create it into a KYC. Or atleast for now id like to get around the 403 forbidden status. Thanks!