Hello there, lauren32.
It's possible that your Square transactions we're not properly mapped. That's why you don't see any sales in your QuickBooks account.
Also, yes, you'll have to connect the account that accepts sales from your Square account. This way, all your Square transactions will automatically be downloaded into QuickBooks.
You can also check these articles for more information when connecting your bank and credit card account:
If you have other concerns with bank transactions, please let me know. I'm here to help you!