What do you mean upload a tax return?
If you are using the TurboTax online editions, as suggested by your post, you can Download the PDF of your tax return after the TurboTax account fees have been paid with a credit card or you have e-filed the federal tax return and it has been Accepted by the IRS.
To access your current or prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on the Year and Click on Download/print return (PDF)
