как сохранить файлы на сервер?

/ LOAD IMAGE 
var fileCollection = []; 
var formData = new FormData(fileCollection); 
var files = []; 
console.log(files); 
 
$('.upload__add-photo').on('change', function(e){ 
	 
  files=e.target.files; 
  files2=e.target.files; 
  console.log("--------after"); 
  console.log(files); 
  $.each(files2, function(i, file){ 
 
    fileCollection.push(file); 
	console.log("fileCollection"); 
	console.log(fileCollection); 
 
    var reader = new FileReader(); 
    reader.readAsDataURL(file); 
	 
	console.log("files"); 
	console.log(files); 
    reader.onload = function(e){ 
 
      var template = '<div class="upload__box upload__your-photo">'+ 
                        '<img src="'+e.target.result+'">'+ 
                        '<div class="delete-photo" onclick="delPrewievPhoto($(this).parent().index(), $(this).parent())">Удалить</div>'+ 
                     '</div>'; 
 
      var valueBoxPhoto = $('.upload__your-photo').length; 
	  console.log("files onload"); 
	  console.log(files); 
	  console.log("fileCollection onload") 
	  console.log(fileCollection); 
      if(valueBoxPhoto > 1){ 
        $('.upload-btn-JS').hide(); 
      } 
 
      if(valueBoxPhoto == 0){ 
        $('.upload-JS').prepend(template); 
      } else { 
        $('.upload__your-photo').eq(-1).after(template); 
      } 
    } 
  }) 
  files=fileCollection; 
  console.log("----------------"); 
  console.log(files); 
  console.log("----------------"); 
}) 
console.log("end"); 
console.log(files); 
function delPrewievPhoto(indexArray, currentItem){ 
 
  fileCollection.splice(indexArray, 1); 
  currentItem.remove(); 
  console.log(fileCollection); 
  if($('.upload__your-photo').length < 4){ 
    $('.upload-btn-JS').show(); 
  } 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
<div class="order__upload"> 
                  <div class="upload upload-JS"> 
                    <label class="upload-btn-JS"> 
                      <div class="upload__box upload__add-photo"> 
                        <input type="file" multiple name="images[]"> 
                        <div class="upload__plus"><span></span><span></span></div> 
                        <div class="upload__text">Добавить фото</div> 
                      </div> 
                    </label> 
                  </div> 
                </div>