Sorry if you used the Desktop installed program the only copy of your return is on that computer and any backups you made. Didn't you make any backups? Can't see Intuit ever letting you store your desktop return online. It's up to you to save your returns. There are many ways. I save to a flash drive and burn a CD when I'm done filing. Only the Online browser version saves your returns online. But then you might not have access to it when you need a copy. It's always up to you to save your returns as both the .tax file and pdf file.
You need the file ending in .tax2020 to transfer into 2021. Sorry you can't use the IRS transcript except for any info you might need to manually enter.
