Does anyone know if there is a video or training posting that explains how to get a 2019 TurboTax "Desktop" file ( not online)  to then transfer into Proseries for 2020 filing?

And how can I get the file from a remote client?  Can it be emailed?  Or other means?

Does it have to first get into "2019" Proseries, then transferred to 2020 Proseries?

Thanks for any insights!