You do not transfer a pdf in to the new return. You need to be transferring the tax file---not a pdf. Did you save it as a tax file?
https://ttlc.intuit.com/questions/1901659-find-your-tax-data-file-in-mac
https://ttlc.intuit.com/questions/1900721-find-your-tax-data-file-tax-file-in-windows
How to transfer last year’s return? https://ttlc.intuit.com/questions/1900883
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