+    gallery_url = CharField(required=False)
+    attachments = CharField(required=False)
+
+    def save(self):
+        temp_dir = mkdtemp()
+        attachment_names = json.loads(self.cleaned_data['attachments'])
+        attachments = {}
+        remote_gallery_url = self.cleaned_data['gallery_url']
+        if remote_gallery_url and attachment_names:
+            for attachment_name in attachment_names:
+                attachment_url = ('%s%s' % (remote_gallery_url, attachment_name)).encode('utf-8')
+                temp_filename = os.path.join(temp_dir, attachment_name)
+                urllib.urlretrieve(attachment_url, temp_filename)
+                attachments[attachment_name] = IOFile.from_filename(temp_filename)