Thank you for posting in the QuickBooks Community. I'm here to help share some additional information about uploading CSV files into QuickBooks.
When you click Let's Go in the Bank upload file window, QuickBooks uploads the bank transactions into the accounts you've selected. @MarshallA is correct that the uploaded transactions appear on the For Review tab
Here's how to check:
On the left pane, select Banking.
At the top left, select the Banking tab.
Under Bank and Credit Cards, select the correct account.