Both previous advises are valid, especially not being able to upload 2019 desktop to 2019 TurboTax online version, for the convenience of record keeping. However for record keeping purpose, you can [UPLOAD] and store your official desktop 2019 filed record (or any other tax related docs) in the TT online cloud, under year "2019" in "Documents" tab /or/ "MY DOCS" section. While these uploaded document info are not transferred to 2019 online version, you will have the record stored online so you may retrieve it later from anywhere and be free of worry from losing the saved file.
TT says "With MyDocs™, easily upload and access your tax documents in one safe and secure place.
Keep in mind that the info on your uploaded documents will not be added to your tax return."
I uploaded my filed 2019 pdf to "MY DOCS" under 2019 year and was able to download back later easily.
