No you do not have to attach any forms if you requested an extension. If the IRS accepted your extension request then they already know it. Just file the return normally. You have until mid-October to e-file; after that e-filing will close.
When you requested your extension you were supposed to pay your estimated tax due. Did you enter the payment you made into your tax return? Go to Federal>Deductions and Credits>Estimates and Other Taxes Paid>Other Income Taxes
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