Add Yoink PDF Services to the Print Dialog
Instead of looking for an Extensions switch in Yoink, place an app alias in your user Library’s PDF Services folder so it can be selected from the Print dialog.
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Create the PDF Services alias
After installing Yoink, locate it in Applications in Finder. Create an alias of Yoink in ~/Library/PDF Services/. If the folder does not exist, create it, place the alias there, and give it a recognizable name such as “Add PDF to Yoink.” This is the procedure in developer Eternal Storms’ usage tips.
Check it from a Print dialog
Open a test document and choose File > Print. Open the PDF menu and look for the alias name. Select it, then check whether the PDF arrives on Yoink’s shelf. Apple documents saving and sharing from the Print dialog’s PDF menu; whether a Yoink alias appears depends on the installation and app compatibility. I did not execute this procedure on a Mac, so this guide does not claim a successful test.
Confirm the file and its location
Check that the PDF appears on the shelf and separately confirm that the original file remains where expected. If the alias is missing, verify the user Library path, alias name, and Yoink version, then reopen the Print dialog. UI and permission behavior can vary, so test with a disposable PDF before moving or deleting an original.
Sources: Eternal Storms: Yoink Usage Tips · Apple Support: Save a document as PDF on Mac