What is wrong with the jump implementation?

Question

Unity

So, I'm a macro, I could not find a ready-made button in the assets store, and decided to improvise, I created a button on the screen, and gave it the name "Jump"

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    private Rigidbody _rigidbody;
    public FixedJoystick joystick;
    public Transform groundCheck;
    public LayerMask groundMask;

    public float playerspeedRL = 5f;
    private float gravity = -9.81f;
    public float radius = 0.72f;

    bool isGrounded;

    Vector3 velocity;

    void Start()
    {
        _rigidbody = GetComponent<Rigidbody>();
    }

    void Update()
    {

    }

    void FixedUpdate()
    {
        isGrounded = Physics.CheckSphere(groundCheck.position, radius, groundMask);

        if (isGrounded)
        {
            _rigidbody.velocity = transform.forward * 5 + transform.right * joystick.Direction.x * playerspeedRL;
        }
        else
        {
            _rigidbody.velocity = transform.forward * 5 + transform.right * joystick.Direction.x * playerspeedRL + transform.up * gravity;
        }



        //_rigidbody.velocity = transform.forward * 5 + transform.right * joystick.Direction.x * playerspeedRL + transform.up * gravity;

    }

    public void JumpScript()
    {
        if (Input.GetButtonDown("Jump") && isGrounded)
        {
            _rigidbody.velocity = transform.up * 30;
            Debug.Log("Jump");
        }
    }

}

And I first tried to push this piece of undercode into Update, then I created a separate function for it and tied it to the button, but nothing works, which can be done so that by clicking on the created UI.Button, this code occurs.

Answer 1

In the inspector, the button has a OnClickdrag-and-drop component on which you will call the method, and then you will select it there.

Answer 2

Input.GetButtonDown("Jump")

has nothing to do with the button on the screen. Open the manual and read what this method does