Yes. You can manually add a bank transaction, adrian6.
You have two options on how to add missing transactions. You can either import them through or manually update your bank connection.
For the detailed steps to import using open banking, you can refer to this guide
You can also take a look on how to manually upload your transactions via a CSV download from your bank and then upload that into QuickBooks. Here is an article with the steps if you don't see your transactions.
If you have other banking questions, please let me know. I've got you!