title: Multiple file uploads Extjs 6 modern toolkit
body: <p>I have done multiple file upload in Extjs Classic Now i want to implement it in Modern toolkit but there are issue 
  there is no fileButton Field
  So i'm using filefield, But i'm not sure how can i get the file data from the filefield here is the code:</p>
  
  <pre><code>                             {
                                  xtype: 'fieldset',
                                  title: 'Attechments',
                                  reference: 'attachmentfile',
                                  padding: 10,
                                  layout: {
                                      type: 'vbox',
                                      align: 'stretch'
                                  },
                                  defaults: {
                                      labelWidth: 130
                                  },
                                  items: [
                                      {
                                          xtype: 'filefield',
                                          text: 'Attach Files',
                                          name: 'files',
                                          listeners:{
                                              change: 'onFileChange'
                                          }
                                      }
                                  ]
                              }
  </code></pre>
  
  <p>and in Viewcontroller: </p>
  
  <pre><code>onFileChange: function (field, e, value) {
         // how to get fileField data so that i can upload via ajax and attach //more files options
  }
  </code></pre>