Can you attach a document to the thank you message?

To whom it may concern, 

We have a client who provides their pricing on request. They want leads to complete a form and on submission, they will automatically send the form with the THANK YOU note. 

Is this possible with Jotform?

Regards,
Candice

You can accomplish this task by enabling the PDF attachment option under Settings >> Emails >> Autoresponder >> Advanced

Please refer to the attached screenshot:

Details of the above explanation can be found in the below link:

How-to-Attach-a-File-to-Autoresponder-Emails

It is not possible to attach a document to the thankyou page, but you can add a downloadable link of the file for users to download.

Guide:

1.) Go to your thank you page.
2.)Find the Insert/Edit link.
3.)Place the file downloadable link to URL

However, if you are referring to something different let us know so we can check for possible options.