JSFiddle - React, Tailwind, and code Playground

HTML

<input type="file">

JavaScript

function upload(event){
	const file = event.target.files[0];
	const formData = new FormData();
	formData.append('mtFile', file);
  var Upload = new XMLHttpRequest();
	Upload.open("POST",target , true);
	Upload.send(formData);
}
document.querySelector('input').addEventListener('change', upload)