You do not "import" last year's tax file. You transfer the 2024 tax file to the new 2025 return, and you do not use a pdf. You transfer the tax file, at the very beginning before you enter any new 2025 information.
How to transfer last year’s return?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/transfer-last-y...
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