How can I use terrain paint texture along with material/shader?

I have created a shader using Amplify Shader Editor with some basic functionalities such as texture and distance blending and applied that shader material to my terrain.

The problem is that applying a custom shader is making the 'Pain Texture' feature inside the terrain tools unusable. I have added multiple-layer palettes and tried to brush off my terrain for fine-tuning but it's not having any effect at all.

If I remove the material though (switch to default), the paint texture seems to be working again. Is there a way to use a custom shader along with pain texture in unity?

 

you can't use custom shader.I'm afraid