Gmail does not have a built-in fax feature, but you can send and receive faxes using FaxBetter Premium through email.

With FaxBetter Premium, you can send faxes directly from your email and receive all incoming faxes straight to your inbox. Any fax sent to your FaxBetter number is automatically delivered to your email address as a PDF.

As long as your email is set up on your Android phone, iPhone, iPad, or iPod, you can receive faxes on your mobile device and view them using the built-in Adobe Acrobat (PDF) reader. This makes it easy to manage faxes without a fax machine, printer, or scanner.

FaxBetter Premium also allows you to send a fax via email by attaching your document and sending it to the FaxBetter fax address. Step-by-step instructions are available here. 

This setup lets you fax documents directly from Gmail or any email app while keeping everything digital and accessible on your devices.