Hello, support94! The process of importing banking transactions or statements is pretty much the same for both the old and new versions of QuickBooks Online.
To make sure we're giving you the right information, can you confirm if you're trying to import a transaction file (like CSV), or downloading an actual bank statement from your bank?
If you're referring to downloading an actual PDF statement, this is automatically done by your bank as long as the account is connected to Online Banking. QBO is also dependent on the data that's provided by your financial institution. It's best to reach out to your bank to check if there's anything that's blocking the system to import the bank statement.
If you're trying to import a CSV file, QBO is highly sensitive to extra rows or non-transaction text. Make sure to delete any header rows, footers, or blank lines before importing. Check out these articles for more details: