Thanks for sharing.

It seemed only chance can import pdf copy is when you create the new Client.

After the new client created,  you can see prior year's from Tax Summary.

Hope they can make this import more easy after the new client created.

below is the scree of create new client:

Create their client profile and 2023 return
by importing their prior-year 1040

We’ll handle the client and dependent info, and we'll make sure you're all set for year-over-year comparisons.