I've edited an invoice before sending to a customer. Will they see previous versions or just the updated?

Welcome to the Community, @khadija-therapyt.

Your customers will only see the version that you have sent. They can't view the previous version, which you have not sent.

For future reference, here is an article to guide you in recording invoice payments: Record invoice payments in QuickBooks Online.

Let me know if you have questions about managing invoices in QuickBooks Online. I'm always here to help. Have a great day.