The article describes how to attach a folder that contains the files instead of choosing the files individually.

While it's not possible to attach the folder itself, you can try this step as a workaround.

You can compress a folder in to a ZIP file. You can also use a third-party application, like WinRAR, WinZip, or 7-ZIP, or any file-compressing application to zip the folder before attaching it.

To compress a folder in Windows:

1. Right-click on the folder you want to compress (the folder that contains files you would like to attach).
2. Select Send To.
3. Select Compressed (zipped) Folder.
4. Click OK when prompted. Once the folder has been compressed, a ZIP file will be created (depending on the application that you use to compress the folder).
5. After that step, you may attach the file, then send it. (Note: Once the file has been received, the recipient needs to unzip it before they'll be able to open the folder.)

This step can also help you reduce the file size before attaching a file. You can visit  "How to add an attachment to an email" to learn more about attaching files.