Make sure both the plugins "Server PDF Plugin" and "PDF Creator Plugin" are marked as enabled.
Create at least one PDF template
Go to Rights Management (the 3 people icon, NOT the gear cogs icon) - Object Types - choose one object type - go to the tab named PDF Creator (see screenshot)
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Click the + button.
Name your template.
Do not forget to click Save at the end.
Create a PDF
Go to Lists - Object Types - choose a type with template - Select one Object - right click - Print
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In Custom Layouts - open the dropdown - choose one (pdf template 1 in below example) - click Print
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Then a PDF is created and downloaded.
If the PDF is too empty, you can edit the template and add content: Rights Management (the 3 people icon) - Object Types - choose the object type - go to the tab named PDF Creator.