It's important that all your transactions are correctly entered for your books to be well balanced. QuickBooks Online is a great tool able to help you create and send sales transactions to customers like sales receipts, invoices or estimates. I can provide some information about checking to see if an invoice has been sent.
To check to see if an invoice has been sent, go to the Sales tab, then Invoices. Click on the invoice in question to open up the edit menu, then click on More, and Audit history. This will show you each time this transaction was saved, as well as the time it was sent for each Save. You can click on each instance of modification, and you'll see the time it was sent, if applicable.
If you have any other questions, feel free to reach out here.
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