Hello @TrevinT,
Let me help share how your bank transactions are downloaded to QuickBooks with online banking.
Normally, the initial connection upon setting up your account will download your transactions within the last 90 days listed on your bank statement.
With this, let's consider manually downloading your transactions from your bank's website and follow the steps below upload to upload them:
- Go to Banking.
- Under Bank and Credit Cards, select your bank account.
- On the Update menu, select File upload.
- Find and open your downloaded transactions.
- Select Upload.
- Click Finish.
In addition, here's an article you can read to learn more about how you can manually upload your transactions: Manually Upload Transactions into QuickBooks Online.
Lastly, I've also added this helpful article that'll help you handle your transactions after uploading them: Categorise and match online bank transactions in QuickBooks Online.
It'll be always my pleasure to help if you have any other concerns, please let me know in the comments down below.