Please see below for troubleshooting steps on transferring from your 2018 return.

https://ttlc.intuit.com/community/troubleshooting/help/troubleshoot-transferring-from-a-prior-year-r...

I filed my 2018 tax return using Turbo Tax Premier. This year I tried to upload the file "taxReturn.tax2018" to Turbotax Online after upgrading to the premier. Initially, it shows the progress at the lower-left corner of the screen. Once it says 100%, it still says "Uploading your Desktop File" and after a few minutes session timed out.

Last year taxReturn.tax2018 file size is around 35MB.

You may need to clear your browser's cache and delete the cookies stored on your computer. A full or corrupted cache can keep TurboTax from functioning properly.

Please see the below FAQ for instructions on how to clear the cache and delete cookies.

Clear Cache: https://https://ttlc.intuit.com/community/troubleshooting/help/how-to-clear-your-cache/00/26135

Delete Cookies: https://https://ttlc.intuit.com/community/troubleshooting/help/how-to-clear-your-cache/00/26135

I already tried clearing cache and cookies. Also tried in incognito window, but still the same problem. I also tried from a different laptop. Also, the link provided by you is not working.

Any fix is highly appreciated.

Since you have tried the different ways suggested to fix your system, but they are not working for you, please click this link and fill out the brief Contact Us form, We’ll help you connect with the right expert. 

Did they fix it?

You are commenting on an old thread that may contain outdated information. So that we can better assist you, what is the specific issue you are experiencing?

@zack2021