Character interaction with single layer water material

Hello,
I try to put a node in my material called “Mask_UV Normal”. I saw it in a tuo to create an interactive single layer water, but I can’t find this node in UE5

In order to use this node, you will need to find the source code for the node and add it to your project. You can try searching the internet for the source code, or you can try contacting the tutorial creator to ask for the source code.

The node in question was likely created by the tutorial creator and is not a built-in node in Unreal Engine 5.