He ctrl-clicked on the paper layer and with the ctrl key pressed (note that there is a dashed line around it) he applied a layer mask to the photo so that it would take on the outline of the selected layer.
I'm guessing you don't have any other comments for this video because most people don't want to waste their time seeing you flick a cursor around the screen and having no idea of what you're doing or why. If you don't take the time to narrate your video, you must include text to explain what you're doing. Otherwise the video is a complete waste of time. Obviously this is just my opinion, but why don't you look at all your other viewer's comments and see what they think? 🤣
what did you do at 1:48 to copy the mask selection to the image layer. There are no command captions on the screen so i have no clue what you are doing