diff --git a/.openclaw-sync/source.json b/.openclaw-sync/source.json
index 84a280c33..7c365129a 100644
--- a/.openclaw-sync/source.json
+++ b/.openclaw-sync/source.json
@@ -1,5 +1,5 @@
 {
   "repository": "openclaw/openclaw",
-  "sha": "bcfa781a1b37aba841e61b88ad21053344bc9f06",
-  "syncedAt": "2026-04-21T17:54:48.686Z"
+  "sha": "38356c658afe0c43030762d9756d5fde1fe697ee",
+  "syncedAt": "2026-04-21T18:01:17.071Z"
 }
diff --git a/docs/channels/synology-chat.md b/docs/channels/synology-chat.md
index a7a8774f7..4194539de 100644
--- a/docs/channels/synology-chat.md
+++ b/docs/channels/synology-chat.md
@@ -113,6 +113,7 @@ openclaw message send --channel synology-chat --target synology-chat:123456 --te
 ```
 
 Media sends are supported by URL-based file delivery.
+Outbound file URLs must use `http` or `https`, and private or otherwise blocked network targets are rejected before OpenClaw forwards the URL to the NAS webhook.
 
 ## Multi-account