Fix back button see BT#12010

main/document/document.php

@@ -645,7 +645,20 @@ if (isset($document_data) && $document_data['path'] == '/certificates') {
 }
 
 if (!$parent_id) {
+    $testParentId = 0;
+    // Get parent id from current path
+    if (!empty($document_data['path'])) {
+        $testParentId = DocumentManager::get_document_id(
+            api_get_course_info(),
+            dirname($document_data['path']),
+            0
+        );
+    }
+
     $parent_id = 0;
+    if (!empty($testParentId)) {
+        $parent_id = $testParentId;
+    }
 }
 
 $current_folder_id = $document_id;