Currently, you can attach PDF documents to your templates by using the 'Add PDF' button at the bottom of the page. This allows users to open the file(s) while looking at the form.
Depending on the size of the attached PDFs, your form can take slightly longer to load or generate a larger file size when exporting it. To improve performance, you now have the option to link PDFs within pre-filled text fields instead.
To do so, follow these steps:
Open the Template Editor for one of your templates
Scroll all the way down, and select 'Add PDF' under 'Template Attachments'
Upload your PDF
Once uploaded, click on the file name above the file
This will open another tab - copy the URL
You can then add this hyperlink to a pre-filled text field, which will allow users to access the hosted file
Remove the attached PDF at the bottom of the Template Editor
See the process in this short video: