Occasionally you may want a form user to have access to supporting documents, as they are completing your form. One solution is to open the form in Acrobat and to attach the document to the form. This is relatively straightforward, but may make it difficult to maintain the document, once the PDF is deployed.
Another solution is to host the document online. This makes it easier to update the document and you just have to make sure that it is always available at the URL that you have hardcoded into the form.
This example demonstrates both of these approches, using either buttons or a dropdown.