Loading CSS data into Princeton PFAA

On Princeton’s FinAid FAQ page Princeton Financial Aid Application - Help
it says:
“Q. I skipped the original chance to use my CSS/PROFILE data and went on to view the PFAA. Now I want to go back and use my CSS ID number. Why can’t I return to that page?
A. Once you open and enter any data on the PFAA, whether you select “save” or not, it is not possible to go back to retrieve PROFILE data.”
This makes it sound like you can (or could if info is out of date) load the data from the CSS form, that you have already filled, into Princeton PFAA (Princeton Financial Aid Application) form. (It also sounds like you have to be careful not to make a wrong step, or else you’d lose the chance to do this.)

Does anyone know how to do this? Is it possible this application year? I found internet discussion of this, but it is earlier years.