Where can I download a copy of filed extension? All I got is a confirmation email saying that extension has been filed.

[SharonD007]

You can print/view your Form Form 4868 - Extension to file in the Print Center.

For TurboTax Online:

1. Open TurboTax 
2. Select Tax Tools, then Print Center 
3. Select Print, save or preview this year's return
4. Follow the directions to print your 2024 Federal returns, including government worksheets. Your 4868 will be included.

Refer to the TurboTax article How do I preview my TurboTax Online return before filing? You will have to pay for TurboTax or register if using the free product.

Refer to the TurboTax Help article How do I preview my return in the TurboTax Desktop software? for TurboTax Desktop.