JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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If you want to show or hide a field or a link to a file depending of an answer, you will have to do it with conditions, follow these steps to show fileds and files.
1.Add the field you want to show and add the link to the file, to add the link to the file, you can do it as the image below :
Now, click on Edit HTML button and click on the Hyperlink icon, paste there the link to the file :
2. Now your conditions should look like these :
You can take a look to my sample form here , also you can clone it if you want :
Hope that helps.
Let us know if you need further assistance, we will be glad to help you.