How do I add a quote to a PDF in Salesforce?

1. Do one of the following. If you’re using Lightning Experience, click Create PDF, and then choose a template from the dropdown list.
2. Generate a preview by clicking Create PDF.
3. Save the PDF to the Quote PDFs related list by clicking Save to Quote.

you can refer article: https://help.salesforce.com/articleView?id=quotes_create_pdf_selected_template.htm&type=5