Put
INT. CLASSROOM WITH WINDOW - DAY with OVERLAY NAME and they’ll show in your story. I can’t believe I didn’t notice that first 
Make sure you put (lower case) ‘with’ between each overlay’s name.
Put
INT. CLASSROOM WITH WINDOW - DAY with OVERLAY NAME and they’ll show in your story. I can’t believe I didn’t notice that first
Make sure you put (lower case) ‘with’ between each overlay’s name.