---

This section details on the original issue you should resolve

<issue_title>GrokChatClient fails to send images (DataContent)</issue_title>
<issue_description>## Describe the Bug

Adding DataContent (such as image) to chat message does not actually get appended to Grok request

Steps to Reproduce

    [SecretsFact("XAI_API_KEY")]
    public async Task GrokImage()
    {
        var messages = new List<ChatMessage>();
        var image = new DataContent(File.ReadAllBytes(@"C:\temp\xai.png"), "image/png");
        var chatMessage = new ChatMessage(ChatRole.User, [new TextContent("Tell me what you see in the image"),image]);
        messages.Add(chatMessage);

        var chat = new GrokClient(Configuration["XAI_API_KEY"]!).AsIChatClient("grok-4")
            .AsBuilder()
            .UseLogging(output.AsLoggerFactory())
            .Build();

        var options = new GrokChatOptions
        {
            ModelId = "grok-4-fast-non-reasoning",
            AdditionalProperties = new()
            {
            }
        };

        var response = await chat.GetResponseAsync(messages, options);
        output.WriteLine(response.Messages.Select(x => x.Text).Last());
    }

Expected Behavior

Grok detects the image

Exception with Stack Trace

Put the exception with stack trace here.

Version Info

Latest source code / v1.0 on nuget both affected

Additional Info

Adding something like this to GrokChatClient seems to fix it, though this is probably more to it.

                if (content is DataContent dataContent)
                {
                    gmsg.Content.Add(new Content { ImageUrl = new ImageUrlContent() { ImageUrl = $"data:{dataContent.MediaType};base64,{dataContent.Base64Data}" }});
                }

<agent_instructions>Look up the xai official docs on how attachments can be sent and make sure we do this in the right way, supporting both URL and data content being submitted.</agent_instructions>

Comments on the Issue (you are @copilot in this section)