If your recent transactions have already posted to your online banking account, QuickBooks will automatically update them, @rachel78 However, if you’re not seeing them in QuickBooks, the transactions may still be pending, which could explain why they aren’t appearing.
When transactions don’t show up despite an active connection, and you can confirm they’re not pending in your online banking, I recommend manually clicking the Update button in the Bank transactions window.

This will prompt the system to retrieve and sync new transactions from the past 90 days for all your connected bank accounts. For more details, you can reference this article: Use automatic and manual online banking updates in QuickBooks Online.
If the issue persists and you encounter an error code during the process, this article provides a list of error codes along with their relevant fixes: Fix bank connection errors in QuickBooks.
Please let us know if you need more QuickBooks assistance.