Hi cdbattis, are you trying to attach a PDF file from your computer to a new message in Gmail? Or are you starting from some other kind of document and you need to first convert it to PDF and then attaching it a new message in Gmail?

Yes, export existing file to gmail. How do I create a link?

A link to a file that is stored where, currently? in your Google Drive?

I don't see the full picture of what you're trying to do. For example:

Scenario #1:

You created a Google Docs document. You want to share it, but you want to share it in PDF format. Google lets you do this by making a special link. More info in this article: https://support.google.com/a/users/answer/9308985?hl=en

Scenario #2:

You have a PDF on your computer that you want to share. You can attach it to a message, but if you want to send a link to it, you first need to store the PDF online somewhere that the recipient could access, such as your Google Drive. Then you can use the sharing feature of Google Drive to generate a link for the recipient.

Something like that?