Get your taxes done using TurboTax

I am using TurboTax Premier on a Mac, as I have for years. All the prior files are stored on this Mac, so there should be no problem for the software to find the files. In looking at the link you sent me to, I think what I might have done inadvertently is to import last year's data from the .pdf version of the 2018 tax file, instead of the TurboTax format file. If that is the case, is there anything I can do to reimport from the tax file, or do I have to begin all over with a new return?