Laravel Dropzone - with submit button

FacturasController.php

//add function to Controller
    public function uploadFiles(Request $request){
        $tipo_factura  = $request->input('tipo_factura');
        $file          = $request->file('files');
        $fileName      = $file->getClientOriginalName();
        $path          = "uploads/facturas/";
        $expediente_id = $request->input('expediente_id');
        
        if ($file->move($path, $fileName)) {
            echo "se movio correctamente el archivo";
            $upload=$path.$fileName;
            $this->save_xml($upload,$expediente_id,$tipo_factura);
            //create model
            $Facturas = new Facturas;
            $Facturas->id_expediente   = $expediente_id;
            $Facturas->tipo_factura    = $tipo_factura;
            $Facturas->xml             = $upload;
            if ($Facturas->save()) {
                echo 'se inserto correctamente';
            } else {
                echo 'ups hubo una falla';
            }

        } else {
             echo "error";
        }
        

       
    }

load.blade.php

@extends('layout.master')
@section('head')
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/4.3.0/min/dropzone.min.css">
@stop

@section('content')
    <div class="col-md-12">
        <div class="panel panel-default">
            <div class="panel-heading">Informacion del expediente <a class="btn btn-default btn-xs pull-right" href="#" role="button"><span class="glyphicon glyphicon-arrow-left"></span> Atras</a></div>
            <div class="panel-body">
          
                <div class="row">
                    <div class="col-md-12">

                        <button id="submit" class="btn btn-primary pull-right" ><span class="glyphicon glyphicon-plus"></span>  Subir todas las Facturas</button>


                        <h4>Facturas</h4>
                        <div class="panel-body">


                        {!! Form::open([ 'route' => [ 'facturas.uploadFiles' ], 'files' => true, 'class' => 'dropzone','id'=>"files"]) !!}
                        <input type="hidden" name="expediente_id" value='{{$expediente_id}}'>
                         
                        <input type="hidden" name="tipo_factura" value='{{$tipo_factura}}'>
                        {!! Form::close() !!}

                        </div>
                    
                </div>
            </div>
        </div>
    </div>






 @endsection
@section('footer')
    <script src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/4.3.0/min/dropzone.min.js"></script>

@stop
@push('scripts')


   $(document).ready(function () {
     Dropzone.options.files = {

        // Prevents Dropzone from uploading dropped files immediately
        autoProcessQueue: false,
        dictDefaultMessage: "Arrastre sus Archivos XML o de click AQUI para cargar sus archivos",
        parallelUploads: 10,
        paramName: "files",
        maxFilesize: 100 ,// Tamaño máximo en MB
        acceptedFiles: ".xml",

      init: function() {
        var submitButton = document.querySelector("#submit")
            myDropzone = this; // closure

        submitButton.addEventListener("click", function() {
          myDropzone.processQueue(); // Tell Dropzone to process all queued files.
        });

        // You might want to show the submit button only when 
        // files are dropped here:
        this.on("addedfile", function() {
          // Show submit button here and/or inform user to click it.

        });

      this.on("queuecomplete", function (file) {
          alert("Todos los archivos se han cargo correctamente");
      });

      },
      success: function(file, response) {
        console.log(response);
      }



    };
});



 @endpush

routes.php

//add source to routes.php
Route::post('uploadFiles',array('as'=>'facturas.uploadFiles','uses'=>'FacturasController@uploadFiles'));