Thank you for visiting the QuickBooks Community, pianogal. This isn't the kind of feeling I'd wish you to have, and I know how vital it is to have the invoices to send to your customer. I'll share an update about this matter and ensure you'll be routed to our support to assist you further.
Please know that issue of several invoices being disappeared in your QuickBooks has been recently tagged as an ongoing issue. Our product engineers are now working to fix this as soon as possible.
I suggest contacting our QuickBooks Online Support Team so they can add you to our notification list. This will help our engineers determine the number of affected users. You'll also receive updates through email once the issue is resolved.
Lastly, you may refer to this article if you need steps to view, create, and edit sales transactions from within the Sales page: View sales transactions in QuickBooks Online.
I'm always here to help if you have any other concerns or questions about invoices in QBO. Just tag my name in the comment section and I'll get back to you as soon as I can, pianogal.
