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External links are needed when making a card link to a PDF open in a new tab or another external link open in a new tab.
Go to Add Content --> Misc. ---> External link
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Fill out the needed details
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Then Save. External links do not require publishing.
How to find the URL of a PDF
View the PDF in Cascade, under the file name, you'll find the path. Simply add https://www.csuchico.edu/ to the path and that will be the URL to the PDF
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In this example, the URL is https://www.csuchico.edu/eop/_assets/documents/16-17eospar-eop-a.pdf
Adding an External link to a Card
Under the link settings for the card, select External, then click on Choose Link to browse for the created external link.
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Select the created external link.
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Once selected.
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Save changes.