Is there a way to send a batch of invoices (going to the same email address) that can all be attached in one single email?

Hello there, lindseyy. 

As of the moment, there's no option to send a batch of invoices in QuickBooks Online (QBO) that can be attached in a single email. As a workaround, you can download and send them outside of QuickBooks.

Here's how:

1. Go to Sales and select Invoices.
2. Filter the Date and tick the box you prefer to download.
3. Hover to the Batch actions dropdown, then select Print.
4. Click the download icon and save it to your local drive.

Also, I've added a screenshot for your visual reference.

After that, you can send all the monthly invoices directly to your client using your personal email.

In addition, you can check out this article to learn how to personalize and add specific info to your sales forms: Customize invoices, estimates, and sales receipts in QBO.

I'll keep an eye out for your reply. If you have further questions about managing your invoices or any QuickBooks-related concerns, feel free to include them in the comments. We're here to assist you 24/7.

Thank you for joining this thread, GaryCPA. I appreciate your efforts in troubleshooting the browser issue on your end. I've tested the Batch Action function here, and it appears to be functioning correctly. When sending invoices in batch, make sure to select the transactions first, as this will enable the Batch Action button. I'm here to assist you in sending your multiple invoices simultaneously.
 

Please follow these steps to send multiple invoices at once:
 

1. Go to the Sales menu.
2. Click on the Invoices tab.
3. Apply the appropriate filters for Type, Date, and Customer.
4. Select the invoices you wish to send in batch.
5. Hit Send to execute the batch-sending process.
    

For more detailed instructions, refer to this article: Create and send multiple invoices in QuickBooks Online Advanced.
 

If the issue persists, I recommend you try using another supported browser to perform the batch sending of invoices.

Once your invoices are successfully sent out, you can move on to receiving payments. Here’s a useful article to guide you on how to record these payments: Record Invoice Payments. 

Additionally, you might want to explore our QuickBooks Live Expert Assisted service to keep your books accurate and up to date. Our team of experts can assist you with matching and categorizing transactions, conducting monthly reconciliations, and preparing financial reports. With QuickBooks Live, you can have peace of mind knowing that your financial records are meticulously managed.

If you have further questions regarding the Batch Action function not working, feel free to reply to this post. I'm here to help you! Have a great day!