Drag and drop файлов для создания тикета в техподдержку

<div style="display:none;">
   <?for ($i=0; $i <50 ; $i++):?>
      <input name="FILE_<?=$i?>" id="TICKET_FILE_<?=$i?>" size="30" type="file" class="ticket-files"/> <br />   
   <?endfor;?>               
   <input type="hidden" name="files_counter" id="files_counter" value="<?=$i?>" />
</div>
   
               
<div id="draggable" class="ui-widget-content">                 
    <div class="helper-text">...перетащите файлы сюда или кликните для загрузки...</div>
</div>

#draggable {
    background: #eaf0f7;
    width: 100%;
    min-height: 80px;
    line-height: 29px;
    text-align: left;
    font-weight: bold;
    position: relative;
    border-radius: 3px;
    padding: 5px 5px 30px;
    -webkit-transition: all 0.3s ease-out;
    -moz-transition: all 0.3s ease-out;
    -ms-transition: all 0.3s ease-out;
    -o-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;

}
#draggable .helper-text{
   position: absolute;
   bottom: 0;
   width: 98%;
   color: gray;
   text-align: center;
   -webkit-transition: all 0.3s ease-out;
   -moz-transition: all 0.3s ease-out;
   -ms-transition: all 0.3s ease-out;
   -o-transition: all 0.3s ease-out;
   transition: all 0.3s ease-out;
}

#draggable span{
    background: white;
    color: #174360;
    padding: 5px 4px 6px 8px;
    border: 1px solid #7497b3;
    border-radius: 7px;
    cursor: pointer;
    -webkit-transition: all 0.3s ease-out;
    -moz-transition: all 0.3s ease-out;
    -ms-transition: all 0.3s ease-out;
    -o-transition: all 0.3s ease-out;
    transition: all 0.3s ease-out;
}
#draggable span:hover{
    background: #cfe3f2;
    
}
#draggable.in {
    background: #dce5ee;
}   
#draggable.in .helper-text{
    color: #000;
}  

$('#draggable').on(
   'click',
   function(e){
       e.preventDefault();
        e.stopPropagation();
      input = $('.ticket-files').filter(function() {                                   
          return !this.files.length;
      }).first();
      input.addClass('arm-add');
      input.trigger('click');
});               
$('#draggable').on(
    'dragover',
    function(e) {                         
        e.preventDefault();
        e.stopPropagation();                         
          $('#draggable').addClass('in');   
    }
)
$('#draggable').on(
    'dragenter',
    function(e) {
        e.preventDefault();
        e.stopPropagation();                          
    }
)
$('#draggable').on(
    'dragleave',
    function(e) {
        $('#draggable').removeClass('in');
});
$('#draggable').on(
    'drop',
    function(e){
       $('#draggable').removeClass('in');
        if(e.originalEvent.dataTransfer && e.originalEvent.dataTransfer.files.length) {
            e.preventDefault();
            e.stopPropagation();
           
            let dT;
            let input;
           for (var i = 0; i < e.originalEvent.dataTransfer.files.length; i++) {
              dT = new DataTransfer();
              dT.items.add(e.originalEvent.dataTransfer.files[i]);
              input = $('.ticket-files').filter(function() {                                   
                return !this.files.length;
            }).first();   
              input[0].files = dT.files;
              $('#draggable').append("<span class='filename-upload' data-id="+input[0].id+">"+e.originalEvent.dataTransfer.files[i].name+" x</span>")                                
           }                                 
        }
    }
);
$(document).on('change','.ticket-files.arm-add',function(e){
   let elem = e.target;            
   if(elem.files.length>0){
      $('#draggable').append("<span class='filename-upload' data-id="+elem.id+">"+elem.files[0].name+" x</span>")      
   }
});
$(document).on('click','.filename-upload',function(e){
   //console.log(e);
   let elem = e.target;
   dT = new DataTransfer();                     
   $('#'+$(elem).data('id'))[0].files = dT.files;                     
   $('#'+$(elem).data('id')).removeClass('arm-add');
   $(elem).remove();
});