How would I get a Texture in the project and send it over to discord using a webhook? Unity

What I am trying to do is take a texture(any texture) from unity and use a webhook from discord to send it to discord.

This is what I have so far keep in mind I started coding not long ago so I'm not very familiar with this;

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;
public class SendMessage : MonoBehaviour
{
    public string Message, Subject;
    public string webhook;
    public Texture2D screenshot;

    // Start is called before the first frame update
    void Start()
    {
    
    }
    IEnumerator SendWebHook(string link, string message, System.Action<bool> action)
    {
         WWWForm form = new WWWForm();
        form.AddField("content", message + screenshot.EncodeToPNG());
        using (UnityWebRequest www = UnityWebRequest.Post(link, form))
        {
            yield return www.SendWebRequest();

            if(www.isNetworkError || www.isHttpError)
            {
                Debug.Log(www.error);
                action(false);
            }
            else
            {
                action(true);
            }
        }
    }
    public void send()
    {
        StartCoroutine(SendWebHook(webhook, Subject + Message, (success) =>
        {
            if(success)
            {
                Debug.Log("good");
            }
        }));
    }
}