C# Telegram API How to send a post with multiple pictures and text?

Question

C++ / C#

Hello, I need to send a post with several pictures and text.
How do I:

public async void NewPost(Post post)
        {
            botClient = new TelegramBotClient(APIKEY");
            Message[] messages = await botClient.SendMediaGroupAsync(
                           chatId: "@dxfnxcvn",
                           inputMedia: post.Photo.Select(x => new InputMediaPhoto(x) { Caption = post.Msg})
                       );
        }

This is a List of images I post.Photo

add text: The Caption = post.Msg

post is published, but the text is visible only if you open a photo in telegram.


In order for the text to be visible under the post, you need to specify Caption for only one image, and not for all, then the post will look like this:


How to specify Caption only for the first image from the list?
Thanks