Added another message pattern for failed imports

README.md

@@ -220,7 +220,11 @@ services:
       # REMOVE_BAD_FILES: |
       #   keep_archives: True
       # REMOVE_FAILED_DOWNLOADS: True
-      # REMOVE_FAILED_IMPORTS: True
+      # REMOVE_FAILED_IMPORTS: |
+      #   message_patterns:
+      #     - Not a Custom Format upgrade for existing*
+      #     - Not an upgrade for existing*
+      #     - \*Found potentially dangerous file with extension*
       # REMOVE_METADATA_MISSING: |
       #   max_strikes: 3
       # REMOVE_MISSING_FILES: True