Please explain more what you are trying to do. Import a 2021 pdf to what? Upload to where? 2021 is the current year. Do you mean import a 2020 return you did last year into 2021? How did you prepare the 2021 return? The .tax2021 file should be more current than a pdf file. Did you use the Online version or the CD/Download Desktop program?
What year do you need to amend? 2021 or 2020? Are you trying to download the .tax file to amend in the Desktop program? You don't "import" it. You just open the .tax file in the program.
