[Function(Category = "Image", Namespace = "ImageFunctions", Description = "Converts a base64 string to an image byte array")]
public static byte[] ConvertFromBase64(string imageString)
{
    if (imageString != null)
    {
        // Convert base 64 string to byte[]
        byte[] imageBytes = Convert.FromBase64String(imageString);
        return imageBytes;
    }
    else
    {
        return null;
    }
}