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You can embed a PDF file onto your Website Builder site by uploading the file to Google Drive (or another service). Once the file is uploaded, add the PDF viewer widget and enter the URL for the file. Note: If you upload the file to Google Drive, you will need to make the document Public in order to have it viewable to your visitors. Learn more. You will also need to switch the URL from view mode to preview mode. At the end of the URL, simply change view?usp=sharing to preview.
Note: You can also simply add a text link to the PDF file. Learn more.