Glad to have you here in the Community. I'm here to help and share some information on how you can download your bank transactions in QuickBooks Online.
When you first connect your account, QuickBooks downloads up to the last 90 days of transactions. However, if you need more than 90 days of transactions, you can export additional historical transactions from the bank and upload them into your QuickBooks company.
To upload or import bank transactions, you must first download transactions from your bank's website in a file format that QuickBooks Online supports, and then upload that file to your QuickBooks Online company.
Once done, you can upload it into your QuickBooks by following these steps:
From the left menu, select Banking, and choose Banking.
Select Upload transactions manually.
Select Browse and choose the file you downloaded from your bank.
From the QuickBooks account drop-down list, select the account to which to upload the bank transactions, and select Next.
When uploading a CSV file, follow the prompts to select columns from the CSV file that match QuickBooks Online banking fields.