Do you have last year's tax file? If Turbo Tax doesn't find it to transfer there should be a browse button.
You need the prior year tax file on your computer. It ends in .tax2020, the same as the personal tax returns. So you need to have the right one.
It should be in Documents in a Turbo Tax subfolder. Or Search your computer for all files ending in .tax or .tax2020. And check the Recycle Bin. The PDF file should be saved there too. If you have Windows 10 check the OneDrive. Or to Drop Box. Check your backups.
Here's an idea. Do you still have 2020 installed? Try opening 2020 program and see if you can get your 2020 return to show up in it. Go to FILE - OPEN. See if it is the right one. Then save it again with a name and place you can find. Go to File - Save As.
