diff --git a/tests/domain/bulk_document_download/test_package_plan.py b/tests/domain/bulk_document_download/test_package_plan.py
index a81e84171..ce9c0541a 100644
--- a/tests/domain/bulk_document_download/test_package_plan.py
+++ b/tests/domain/bulk_document_download/test_package_plan.py
@@ -64,3 +64,15 @@ def test_skips_and_reports_a_document_with_no_document_type() -> None:
     skipped = plan.skipped[0]
     assert skipped.s3_key == "mystery.bin"
     assert skipped.landlord_property_id == "LP1"
+
+
+def test_packaged_filename_is_the_document_type_with_the_original_extension() -> None:
+    # Arrange — a photo pack stored under a prefixed key with a .zip extension;
+    # the file inside the archive should be named by type but stay openable.
+    doc = _doc(document_type="photo_pack", s3_key="surveys/2026/pack.zip")
+
+    # Act
+    plan = plan_download_package([doc])
+
+    # Assert
+    assert plan.entries[0].zip_path == "12 Oak Street (LP1)/photo_pack.zip"