JSFiddle - React, Tailwind, and code Playground

HTML

<form enctype="multipart/form-data"
      method="post"
      action="seu_script.php"
      id="form">
  <input type="file" name="arquivo" id="file" />      
</form>

JavaScript

file = document.getElementById("file");
form = document.getElementById("form");

file.addEventListener('change', function(){
	form.submit();
})