You can send a zip file in Gmail if you want to send a large file to someone without using Google Drive.

To unzip a file on your computer or phone, you can use tools that come pre-installed on the device. In some cases, using a third-party app might help.

But if you prefer to keep local copies of your Office files, or if you use alternative cloud storage services such as Google Drive, you should force Office to save files to your computer.