public Task SendMessage(
    string messageContent,
    ChatRole role,
    List<AIChatUploadFileInfo> files = null
)

<DxAIChat @ref="Chat" CssClass="demo-chat" />
<DxButton Text="Start dialog" Click="StartDialog" />

@code {
    DxAIChat Chat { get; set; }

    void StartDialog(MouseEventArgs args) {
        var filePath = "C:\\Users\\Public\\images\\AlbertEinstein.jpg";

        var fileBytes = File.ReadAllBytes(filePath);

        var testFiles = new List<AIChatUploadFileInfo> {
            new AIChatUploadFileInfo(
                name: Path.GetFileName(filePath),
                type: "image/jpeg",
                size: fileBytes.Length,
                data: new ReadOnlyMemory<byte>(fileBytes)
            )
        };
        Chat.SendMessage("What is s on the image?", Microsoft.Extensions.AI.ChatRole.User, testFiles);
    }
}