you can not import a pdf of your 2021 tax return even if created by a Turbotax program into any 2021 Turbotax tax program. you can only use a xxxx.tax2021 file and that's not an import, you merely open the file. if you are saying that Turbotax updates change the return from what was filed as represented by the pdf you saved, then what was changed? it may be necessary to make some entries in the tax file to get back to where you were and then close and then do the amendment. after opening to amend delete those extra entries and make whatever proper corrections you think necessary. please note that in some cases an amended return is not necessary, the IRS will catch the errors and make the changes. so if you tell us why and what items you are amending perhaps we can give better instructions.
