@raoulwatson You can't transfer a pdf you made from a scanned printout. It has to be an actual electronic pdf from the program. And I don't think you can transfer a Turbo Tax PDF into the Turbo Tax program, it has to be the tax data file ending in .tax2020. Didn't you make any backups when you were done filing last year?
Are you on Windows or Mac?
How to Transfer into the Windows Desktop program
https://ttlc.intuit.com/community/entering-importing/help/transfer-last-year-s-return-to-turbotax-fo...
How to Transfer from a pdf into the Windows Desktop program
https://ttlc.intuit.com/community/using-turbotax/help/can-i-transfer-last-year-s-pdf-into-the-turbot...
