diff --git a/frontend/app.py b/frontend/app.py
index 9dacec7..6197fe6 100644
--- a/frontend/app.py
+++ b/frontend/app.py
@@ -228,10 +228,10 @@ def session_upload(
 
         logger.info("Starting background download: %s → %s", url, dest)
         try:
-        proc = subprocess.Popen(
-            ["aria2c", "-x8", "-s8", "-d", str(dest.parent), "-o", dest.name, url],
-            stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
-        )
+            proc = subprocess.Popen(
+                ["aria2c", "-x8", "-s8", "-d", str(dest.parent), "-o", dest.name, url],
+                stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
+            )
         except Exception as exc:
             return JSONResponse({"phase": "error", "error": f"Failed to start download: {exc}"}, status_code=500)