I reported this in another thread. It's not the bank. I took an old QBO file that imported fine last week and tried to re-import the exact SAME FILE and it does not import. There's no import in the audit log, no error messages, it just says it imported but it doesn't. I've tried clearing browser data, going incognito, using different computers, different user logins. Something changed that might not effect every institutions' QBO export design, but it clearly affecting some of your users, so please don't try to research the bank. If last week's file imported and this week the SAME file cannot, it is a QB issue.
