Quickbooks imports QBO (web connect) files under the Bank Feed Center. Similarly, direct download from your bank or credit card account imports transactions under Bank Feeds as well. In both cases, Quickbooks expects you to do the following:
review transactions and assign vendor records for each transaction (see the "Download as" column where Quickbooks imports payee names from a QBO file or direct download)
assign expense/income accounts for each transaction (prefill these accounts for vendor records and these accounts will be used to refill transactions for matched vendor records, but can be adjusted for each transaction)
add to the register or ignore a transaction to be deleted