diff --git a/src/applications/conpherence/controller/ConpherenceUpdateController.php b/src/applications/conpherence/controller/ConpherenceUpdateController.php
--- a/src/applications/conpherence/controller/ConpherenceUpdateController.php
+++ b/src/applications/conpherence/controller/ConpherenceUpdateController.php
@@ -79,6 +79,29 @@
               $user,
               $conpherence,
               $message);
+
+            $text_metadata = $request->getStr('text_metadata');
+            if ($text_metadata) {
+              $text_metadata = phutil_json_decode($text_metadata);
+              if (
+                isset($text_metadata['attachedFilePHIDs']) &&
+                is_array($text_metadata['attachedFilePHIDs'])
+              ) {
+                $attached_file_phids = idx($text_metadata,
+                  'attachedFilePHIDs',
+                  array());
+                if ($attached_file_phids) {
+                  $metadata_object = array(
+                    'remarkup.control' => array(
+                      'attachedFilePHIDs' => $attached_file_phids,
+                    ),
+                  );
+
+                  $xactions[0]->setMetadata($metadata_object);
+                }
+              }
+            }
+
             $delete_draft = true;
           } else {
             $action = ConpherenceUpdateActions::LOAD;