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I checked your form and it appears that you were able to add a link to the terms successfully.
However, when I clicked the link, I was unable to download the PDF.
To make sure that the user gets the pdf when they click the link, I would suggest to store the file in your server or in a storage service such as dropbox or google drive. Then you can use the link provided by the service to make sure that the user successfully downloads the file.
Here's a guide that can help:
If you need further assistance, please let us know.