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That's right, emcabrera,
Newly connected banks goes back up to 90 days worth of past transactions. You can use web connect to import your bank transactions that were not downloaded.
Start off with downloading transactions from your bank's website:
Here's how to upload the file to your QBO:
Check this article for more information: How to upload more than 90 days of bank transactions.
Please feel free to leave a comment below if you need any further assistance.