When you link an account, QBO will let you download the last 90 days of transactions, rkl.
You can use Web Connect files to import additional transactions directly into QBO. Just export them from your bank using these file types:
Please take note that the maximum file size QBO allows for these transactions is 350 KB. You can check the file size by following these steps:
You can refer to this article to learn more about uploading more than 90 days of bank transactions.
Please let me know if you need anything else. Thanks.