JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.11/summernote-bs4.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.11/summernote-bs4.js"></script>
<div class="container">
  <div class="row">
    <div class="col-md-3">
      <div class="col-md-4">
        <div class="summernote"></div>
      </div>
    </div>
  </div>
</div>

JavaScript

$(document).ready(function () {

  $('.summernote').summernote({
    callbacks: {
     onImageUpload: function(files, editor, welEditable) {
      var url= sendFile(files[0], editor, welEditable);
    }
  },
  height: 300,
  focus: true,

});

  function sendFile(file, editor, welEditable) {
    data = new FormData();
    data.append("file", file);
    console.log(editor);
    /* $.ajax({
      data: data,
      type: "POST",
      url: "Test/test",
      cache: false,
      contentType: false,
      processData: false,
      success: function(url) {
        editor.insertImage(welEditable, url);
        console.log(url);
      },
      error: function(jqXHR, stat, err){
        console.log(stat+':'+err);
      }
    }); */
  }
});