"Add new attachment" button works.

src/scripts/tutti/6_jquery_extensions.js

@@ -39,4 +39,24 @@
         }, scroll_duration_msec);
     }
 
+    /**
+     * Marks the queried buttons as "Add New Attachment" buttons.
+     */
+    $.fn.addNewAttachmentButton = function() {
+        var $button = this;
+        $button.click(function() {
+            console.log('Cloning last repeating group');
+            var lastRepeatingGroup = $button
+                .parent()
+                .next('.attachments')
+                .children('ul.fieldlist')
+                .children('li')
+                .last();
+            console.log(lastRepeatingGroup.toArray());
+            var cloned = lastRepeatingGroup.clone(false);
+            cloned.insertAfter(lastRepeatingGroup);
+            resetAttributeNames(cloned);
+            cloned.find('.fileupload').each(setup_file_uploader)
+        })
+    }
 }(jQuery));

src/templates/nodes/edit_embed.jade

@@ -252,14 +252,7 @@ script(type="text/javascript").
 		section.find('div.form-upload-progress-bar').hide();
 	}
 
-	if (document.getElementById("attachments") !== null) {
+	$("#attachments-action-add").addNewAttachmentButton();
-		$("#attachments-action-add").on('click', function(){
-			var lastRepeatingGroup = $('#attachments > li').last();
-			var cloned = lastRepeatingGroup.clone(true);
-			cloned.insertAfter(lastRepeatingGroup);
-			resetAttributeNames(cloned);
-		});
-	}
 
 	if (document.getElementById("files") !== null) {
 		$("#files-action-add").on('click', function () {