Update app.py

app.py

@@ -11,6 +11,7 @@ def see_files(path):
 
 def unzip_file(filename):
     cmd = f"unzip -P lhchensllu ./Movid/{filename} -d ./videos"
+    os.system(cmd)
 
 def greet(name):
     return "Hello " + name + "!!"