diff --git a/worker/src/rebuild.ts b/worker/src/rebuild.ts
index 484d1b4..f84748e 100644
--- a/worker/src/rebuild.ts
+++ b/worker/src/rebuild.ts
@@ -333,6 +333,14 @@ async function scanDestinationChannel(
           fileSize: BigInt(doc.document.size),
           date: new Date(msg.date * 1000),
         });
+      } else if (doc?.file_name) {
+        // Not matched by any pattern in archive/detect.ts, so it is dropped without a
+        // packages/skipped_packages row. Grep "unrecognized attachment" to find naming
+        // schemes we do not handle yet.
+        log.debug(
+          { chatId: chatId.toString(), messageId: msg.id, fileName: doc.file_name },
+          "Skipping unrecognized attachment (no archive/document pattern matched)"
+        );
       }
     }
 
diff --git a/worker/src/tdlib/download.ts b/worker/src/tdlib/download.ts
index 7e155b7..089ca37 100644
--- a/worker/src/tdlib/download.ts
+++ b/worker/src/tdlib/download.ts
@@ -267,6 +267,15 @@ export async function getChannelMessages(
           });
           continue;
         }
+        if (doc?.file_name) {
+          // Not matched by any pattern in archive/detect.ts, so it is dropped without a
+          // packages/skipped_packages row. Grep "unrecognized attachment" to find naming
+          // schemes we do not handle yet.
+          log.debug(
+            { chatId: chatId.toString(), messageId: msg.id, fileName: doc.file_name },
+            "Skipping unrecognized attachment (no archive/document pattern matched)"
+          );
+        }
 
         // Check for photo messages (potential previews)
         const photo = msg.content?.photo;
diff --git a/worker/src/tdlib/topics.ts b/worker/src/tdlib/topics.ts
index 6579388..4d313f5 100644
--- a/worker/src/tdlib/topics.ts
+++ b/worker/src/tdlib/topics.ts
@@ -280,6 +280,15 @@ export async function getTopicMessages(
         });
         continue;
       }
+      if (doc?.file_name) {
+        // Not matched by any pattern in archive/detect.ts, so it is dropped without a
+        // packages/skipped_packages row. Grep "unrecognized attachment" to find naming
+        // schemes we do not handle yet.
+        log.debug(
+          { chatId: chatId.toString(), topicId: topicId.toString(), messageId: msg.id, fileName: doc.file_name },
+          "Skipping unrecognized attachment (no archive/document pattern matched)"
+        );
+      }
 
       // Check for photo messages (potential previews)
       const photo = msg.content?.photo;