Thank you for adding a post here on the Community page. I can share with some information about connecting bank or credit accounts to QuickBooks and how to import 90days or older transactions.
Once your bank/credit card account is linked to QuickBooks, the system automatically downloads and the latest available transactions from your bank. For 90days or older transactions, you can upload them manually.
First, get the transactions from your bank. Then, prepare an Excel CSV file and manually import the transactions to QuickBooks. For your guide, I recommend checking these articles: