Do you have a PDF you would like to send in a bulk message? Maybe a newsletter or any other important information?

While you can not directly attach a file you can share them by adding them to your website and using that URL in your text and/or emails. Alternatively, you can also upload them to your Google Drive and share that URL*

A benefit of having it on your site is there will be more traffic and more time spent on your site which helps improve your SEO.

In an email, you can add a button to navigate the recipient to the URL

In a text, you can also add the URL along with your message

*If you are using a Google drive link be sure to make the file public by changing your sharing settings. This way anyone who receives the link will have access.