Make sure your brokerage firm is listed as an approved partner. Depending upon the type of investment that is imported (interest income, dividend income, stock sales), you can navigate back to the input section as applicable and review the entries there. See these links for guidance on how to reach each of these sections to import the information:
Where do I enter Form 1099-INT?
Where do I enter my 1099-DIV in TurboTax Online?
Where do I enter or import a 1099-B?
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