Can I set conditional logic on sending PDF Attachment in the email noti

As a possible workaround, you can create two notifications (with and without a PDF attachment). Then you can use conditions to send the appropriate notification.

So, you will send e-mails based on user's answer. In order to do this, you can check and follow this walkthrough:

https://www.jotform.com/help/167-How-to-Send-Email-Based-on-User-s-Answer#_

Let us know if you need any further assistance.