Thanks for sharing a reply in this thread, moderno.
When your deposit is downloaded from the Banking section, if it has the same amount and date, QuickBooks Online will automatically recognize a match. What you can do is check the payment then confirm it to match. This process will ensure that your accounting reports are accurate.
To match, you can follow these steps:
Go to Transactions or Banking > For review.
Find the deposit and check the payment
Click Confirm to match.
Here's a sample screenshot to see what it looks lie: