Unresolved external symbol: static function declared in class defined in cpp file

my code looks like this:

//Renderer.h file
#pragma once

class Renderer {
public:
static int Test();
};

//Renderer.cpp file
#include "../Header/Renderer.h"
#include <iostream>

int Renderer::Test() {
    std::cout << "This is a test" << std::endl;
    return 1
}

//main.cpp file
#include "Renderer/Header/Renderer.h"
int main()
{
    Renderer::Test();
}

Whenever I try to run this code, I get an unresolved external symbol error. I tried creating a different file with a dummy class, had the same exact code and this one worked just fine without any errors.

I really don't get what I did wrong.