Automatically add the same attachment to every record that is created

Hello,

I feel like this is relatively easy but I am stuck. I have automations set up to send out a welcome email each time a project is sold. I have spec sheets and standard documents I want to send with each email. They are standard forms that are the same for each project. I want these to automatically attach to a record when it is created. I have the forms set up as their own table. How do I get Airtable to link these forms whenever I create a new record?

thank you