MQL4でDiscordに画像を送信したい

MT4で、WebReqestsを使いDiscordに画像を送信したいです。
以下のコードでファイルパスのみしか送信できません。

どのように記述すればよいでしょうか？お詳しい方ご教授お願いいたします。

c
1//+------------------------------------------------------------------+
2//|                                                  mt4_discord.mq4 |
3//|                        Copyright 2022, MetaQuotes Software Corp. |
4//|                                             https://www.mql5.com |
5//+------------------------------------------------------------------+
6#property copyright "Copyright 2022, MetaQuotes Software Corp."
7#property link      "https://www.mql5.com"
8#property version   "1.00"
9#property strict
10
11input string WebhookURL = "";
12//+------------------------------------------------------------------+
13//| Expert initialization function                                   |
14//+------------------------------------------------------------------+
15int OnInit()
16  {
17//---
18   MessageBox(AlertDiscord(WebhookURL, "hoge"));
19//---
20   return(INIT_SUCCEEDED);
21  }
22//+------------------------------------------------------------------+
23//| Expert deinitialization function                                 |
24//+------------------------------------------------------------------+
25void OnDeinit(const int reason)
26  {
27//---
28   
29  }
30//+------------------------------------------------------------------+
31//| Expert tick function                                             |
32//+------------------------------------------------------------------+
33void OnTick()
34  {
35//---
36   
37  }
38//+------------------------------------------------------------------+
39bool AlertDiscord(const string  url, const string text)
40{
41   string img = "AUDJPY-1.png";
42   string path = TerminalInfoString(TERMINAL_DATA_PATH) + "\\MQL4\\Files\\" + img;
43    int status_code;
44    string headers;
45    char data[];
46    char result[];
47
48    if (IsTesting()) {
49        return(false);
50    }
51
52    StringToCharArray("content=" + path, data, 0, WHOLE_ARRAY, CP_UTF8);
53
54    status_code = WebRequest("POST", url, NULL, NULL, 5000, data, 0, result, headers);
55
56    if (status_code == -1) {
57        Print(GetLastError());
58        return(false);
59    }
60
61    return(true);
62}