For cash, or anything no app notified you about. Pick the account itself - one card is one account, so there are no card digits to enter.
Filtered out
Alerts the classifier judged not to be transactions. Check this for the first couple of weeks — if a real payment is here, tell me which rule caught it.
Back up
Everything lives in this browser only. Export the log now and then and keep it in iCloud — it is the only copy.
Import
Old ledger-YYYY-MM.txt op logs, or raw inbox captures. Pick several at once and they are applied oldest file first. Anything already here is skipped, so importing twice is safe.