Issue while uploading pdf file

Grafana k6 OSS Support
1 

import http from 'k6/http'
import {check} from 'k6'
import {Trend} from 'k6/metrics'
import { sleep } from 'k6'
import papaparse from 'https://jslib.k6.io/papaparse/5.1.1/index.js';
import { SharedArray } from 'k6/data';
import { FormData } from 'https://jslib.k6.io/formdata/0.0.2/index.js';
import { randomIntBetween } from 'https://jslib.k6.io/k6-utils/1.2.0/index.js';



var token;
let doc = open('./try.pdf');

export const options = 
{
  scenarios: {
    booking_patch: {
             executor: 'ramping-vus',
             startVUs: 0,
             stages: [ { duration: '1s', target: 1 },
                       { duration: '2s', target: 1 },
                       ]

    }}
};


export default function () {
 
  
// Getting a random  id 

let ID=randomIntBetween(1,100000000000);

const posturl = `https://dummy.com/doc/${ID}`;  

const fd = new FormData(); 

 

 let doc={
    prod:'Dull',
    do:'boo',

 }

 let docjson = JSON.stringify(doc);

 
 fd.append('d', http.file(doc, 'try.pdf','application/pdf'));
 fd.append('docum',docjson);
// const data = {}

 
   
// calling the post api

 const res = http.post(posturl,fd.body(), { headers: 
  {
  'Content-Type': 'multipart/form-data; boundary=' + fd.boundary,
  'Authorization': 'Bearer eyJ0'
} });

 console.log(JSON.parse(res.body));

 //checking status code response

 check(res, {'Is Success is 200' : (r) => r.status === 200})

 sleep(1);
  
}

above code is throwing

{“type”:“about:blank”,“title”:“Unsupported Media Type”,“status”:415,“detail”:“Content-Type ‘text/plain’ is not supported.”,“instance”:“/doc/33218925310”}