Good day, @dennis48.
I'll help you accomplish your task in QuickBooks Self-Employed (QBSE).
When downloading the CSV file, I'd recommend reaching out to Apple Customer Support. Once you get the file, you'll have to upload them in either the following 3-column or 4-column format.
Please take note that each bank formats CSV files differently. This means you may be unable to import CSVs from certain banks since files don't have the format QuickBooks needs. Thus, you'll have to reformat them using these details: Format CSV files in Excel to get bank transactions into QuickBooks.
When you're done, you can now upload them into QBSE.
Once they're in, it's time to review and categorize your transactions to put them in your accounts.
Please let me know if you need further help in importing files to QBSE. I'll be here to help you out. Have a good one.