How can I add a downloadable link for a document in my form?

Greetings,

You shall upload your document to google drive or any other host to get a sharable or downloadable link for your document, then by using a Paragraph element you can add this link into your form, please check this guide for more details.
https://www.jotform.com/help/431-how-to-add-a-downloadable-file-to-your-form

Let us know if you need further assistance.