diff --git a/l4d2web/tests/e2e/test_files_overlay.py b/l4d2web/tests/e2e/test_files_overlay.py
index adb538a..e1c9b54 100644
--- a/l4d2web/tests/e2e/test_files_overlay.py
+++ b/l4d2web/tests/e2e/test_files_overlay.py
@@ -73,3 +73,46 @@ def test_edit_text_file_save_round_trip(page: Page, files_overlay_server) -> Non
     # Modal close is async (await postJson then closeRouted()).
     expect(page.locator("#modal-container")).to_be_hidden(timeout=5000)
     assert (overlay_root / "server.cfg").read_text() == new_content
+
+
+def test_create_new_file_routed(page: Page, files_overlay_server) -> None:
+    """Click `+ new file` at the overlay root, fill the routed
+    new-file editor, click Create, and assert the file lands on disk
+    AND the row appears in the tree.
+
+    The routed new-file modal is the SAME template as the edit modal
+    (overlay_file_editor.html with is_new=True). The differences this
+    test exercises:
+      * textarea has data-rel-path="" — routedSaveClicked branches on
+        the empty value into the "compose fullPath from filename"
+        path, not the rename-on-save path.
+      * Save button reads "Create", not "Save".
+      * scheduleRefresh(parentOf(fullPath)) fires after POST — for a
+        root-level file that's refreshFolder("") which re-fetches the
+        whole root listing; the new row should appear without a page
+        reload.
+    """
+    base = files_overlay_server["base_url"]
+    overlay_id = files_overlay_server["overlay_id"]
+    overlay_root = files_overlay_server["overlay_root"]
+    _open_overlay(page, base, overlay_id)
+
+    page.click('button[data-action="new-file"][data-target-path=""]')
+    _wait_for_routed_editor(page)
+    # Confirm the fragment opened in is_new mode (empty rel-path).
+    assert page.locator('textarea[data-rel-path=""]').count() == 1
+
+    new_filename = "new-file.cfg"
+    new_content = 'sv_cheats 1\nmp_gamemode versus\n'
+    page.fill('input[data-editor-filename]', new_filename)
+    page.evaluate("(text) => window.__filesEditor.setContent(text)", new_content)
+
+    page.click(".files-editor-save")
+
+    expect(page.locator("#modal-container")).to_be_hidden(timeout=5000)
+    assert (overlay_root / new_filename).read_text() == new_content
+    # Tree refresh is debounced 50ms then HTMX-fetched — wait for the
+    # new row to appear rather than asserting synchronously.
+    expect(
+        page.locator(f'.file-tree-row-file[data-target-path="{new_filename}"]')
+    ).to_be_visible(timeout=5000)