Issue #6064 --> added the code to documents view (edited multiple/add.html and add-multiple.js) to create success message (#6427)

wagtail/documents/static_src/wagtaildocs/js/add-multiple.js

@@ -116,6 +116,8 @@ $(function() {
 
         $.post(this.action, form.serialize(), function(data) {
             if (data.success) {
+                var statusText = $('.status-msg.update-success').text();
+                addMessage('success', statusText);
                 itemElement.slideUp(function() {$(this).remove()});
             } else {
                 form.replaceWith(data.form);

wagtail/documents/templates/wagtaildocs/multiple/add.html

@@ -69,6 +69,7 @@
             <div class="right col9">
                 <p class="status-msg success">{% trans "Upload successful. Please update this document with a more appropriate title, if necessary. You may also delete the document completely if the upload wasn't required." %}</p>
                 <p class="status-msg failure">{% trans "Sorry, upload failed." %}</p>
+                <p class="status-msg update-success">{% trans "Document updated." %}</p>
                 <p class="status-msg failure error_messages"></p>
             </div>
         </li>