Okay, I just experienced the same (or similar) adventure. I spent a couple hours on the phone with a TurboTax Product Specialist, to no avail. This forum put me on the right track. The root problem seems to be that Google Drive is incorrectly identifying the saved TurboTax files as archived and compressed, when they are not. This leads to Drive suggesting a third party unzipping app, which creates what are apparently junk files and folders. My original file on Drive had the correct .tax2019 extension, without the additional .zip that previous posts mention. After false starts cause by trying to unzip and then rename the junk file, I simply downloaded the original file from Drive to the Mac and it worked.
Strangely, the junk unzipped file appeared to have been read by TurboTax. The application gave an error indicating that it was the wrong tax year, as opposed to saying it was unreadable or invalid. This led me down a blind alley of assuming it was either a glitch in the unzipping process or that the issue was in going from Windows Desktop in 2019 to Mac Desktop in 2020.
Another lesson learned in the process is this: Intuit's claim that it can bring in previous year data from a .pdf file seems to be overstated at best. After I had trouble with the .tax2019 file, I tried the .pdf file. It seemed to work, as the program did bring in SOME data, just not the really important stuff, like rental property depreciation history and tax history. I spent a few hours entering W-2's and 1099's before realizing the previous year info was incomplete. I explained all of this to the TT Product Specialist and she concluded that I "must have saved it wrong." I had used the TT "detailed records" option for the save and when I browsed or printed the file, all of the detailed data was there. So...not sure what's up there, but I'll never depend on a .pdf file as a TT backup plan again!
Thanks to all of the previous posters! I hope this additional info helps someone in the future to avoid the kind of frustration I experienced today.
