I would like to open my 2020 Return that I filed with Turbotax but can't find a way to access it online. Not enough characters in this box to provide the background.

I have Turbotax desktop but it appears I only have the 2020 pdf file on my laptop. When I go to Turbotax online I am prompted to start a return, so I go to Intuit and can see my returns since 2017 but they are all pdfs.  I want to amend my 2020 return but can't find a way to access a file type that my desktop can open