If your return did not transfer from 2020 properly, there are a few trouble-shooting steps you can try.
Open 2020 TurboTax (check that the W-2s nd 1099-Div's are there) and save a second copy of your file to your computer, then try the transfer with that file.
Uninstall/re-install TurboTax.
Here's more info on Troubleshooting Transferring Prior Year.
@jwarnke