If QuickBooks Online doesn't connect to your bank yet, or if you need to download more than 90 day's worth of transactions, you have the option to use WebConnect files. All you need to do is make sure your bank supports these types of file downloads (QFX, QBO, CSV, and OFX), so you can import your expense transactions from Receipt Bank. You may also reach out to your third-party provider for Receipt Bank to check if they have ways on how to import your expenses to QBO.
If you have any further questions, or simply need someone to talk to about QuickBooks, please don't hesitate to let me know. You can always leave a comment below and I'll be with you as soon as I can.