I assume that you are talking about a 2015 tax return that was not prepared with TurboTax Online. Is that correct?
What do you mean by "upload"? Are you just trying to store a copy of the 2015 tax return in TurboTax Online, or do you want to transfer information from your 2015 tax return into your 2016 tax return in TurboTax Online?
Do you have a PDF of the 2015 tax return that you want to upload?
If you want to transfer information, what software did you use to prepare the 2015 tax return? If you used the CD/Download TurboTax software, do you have the .tax2015 file for the return?
