How to send multiple email with attachments using send grid - sendgrid

Question

I'm using the send grid api to send emails in my c# app, and I can't seem to figure out how to send an email with multiple attachments. I can send an email with a single attachement, but not multiple. I can see that there are four methods used for attachments(see below), but there is only one that allow you to send a list of attachements "IEnumerable attachments", however it's a return type is void. Can someone tell me how to send multiple attachments using the send gris api?
[![Send Grid methods for addding attachments](https://i.stack.imgur.com/Obf3n.png)](https://i.stack.imgur.com/Obf3n.png)
public async Task<SendResponse> SendHTMLWithAttachmentSendgrid(List<EmailAddress> recipientEmailList, string subject, string htmlContent, string[] attachmentFilePaths, bool showAllRecipients = false)
{
SendResponse emailResponse = new SendResponse();
try
{
List<SendGrid.Helpers.Mail.Attachment> attachments = new List<SendGrid.Helpers.Mail.Attachment>();
SendGrid.Helpers.Mail.Attachment attach = null;
//The total size of your email, including attachments, must be less than 30MB.
foreach (string item in attachmentFilePaths)
{
var stream = File.OpenRead(item);
//string[] contentArray = fileName.Split('.');
//string contentType = contentArray[1].ToString();
var streamCount = stream.ToString();
System.IO.BinaryReader br = new System.IO.BinaryReader(stream);
byte[] bytes = br.ReadBytes((Int32)stream.Length);
string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);
string[] filePathArray = item.Split('\\');
string fileName = filePathArray.LastOrDefault();
attach = new SendGrid.Helpers.Mail.Attachment() { Filename = fileName, Content= base64String };
attachments.Add(attach);
}
var from = new EmailAddress(DefaultSenderEmailAddress);
var msg = MailHelper.CreateSingleEmailToMultipleRecipients(from, recipientEmailList, subject, string.Empty, htmlContent, showAllRecipients = false);
MailHelper.CreateSingleEmailToMultipleRecipients(from, recipientEmailList, subject, string.Empty, htmlContent, showAllRecipients = false).AddAttachments(attachments);
var response = await this.SendGridClient.SendEmailAsync(msg);
}
catch (Exception ex)
{
_logger.LogError($"The following error occurred:{ex.Message}.");
}
return emailResponse;
}
I'm expecting to send multiple attachments in my email, using the Send Grid Api