Darken blending mode not working
Hi guys, I wonder if someone could help. I have the updated version of Photoshop CC 2018 and I noticed that the darken blending mode doesn't work. I am trying to do a "window pull" for real estate photography. I followed the steps in this Youtube video but I just can't get it work. Window Pull for Real Estate Photography using Darken Mode - YouTube
Did anyone experienced the same problem or maybe I am missing something?
This is my screenshot:

