diff --git a/config/config.exs b/config/config.exs
index d691753bd..b92d3ccbb 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -760,8 +760,8 @@
   ],
   preview: [
     size: 50,
-    max_waiting: 10,
-    timeout: 10_000
+    max_waiting: 20,
+    timeout: 15_000
   ],
   upload: [
     size: 25,