How to let Unity recognize Saumsung S-pen input as Touch input rather than Mouse Click

I am making an android game.
because it is a mobile game, i made lots of functions which work with Touch inputs.

but the thing is, it seems like Unity recognize Samsung S-pen input as a mouse input.
as a result, some of functions that require Touch inputs are not working with S-pen.

Is there a way to let Unity recognize S-pen input as a Touch input rather than a mouse click event?

Did you ever figure out how to properly use the S-Pen with Unity? There’s no real documentation, unfortunately.