You can add any custom folder under This PC in File Explorer in Windows 11/10 by editing the Registry by following this tutorial.

Learn how to rename all file extensions in a folder & sub-folders at once on Windows 11/10. You can batch rename or rename all file extensions in bulk using this guide.

Google Drive is a handy place to store your data, and it comes with a regular Gmail account. You can get more out of it by tying it to Windows File Explorer.