How to Add a File to Multiple Folders in Google Drive

Here’s how you can place existing files or folders inside different multiple folders on Google Drive without making copies of the file.
Open the Google Drive website in your desktop’s web browser and select one or more files or folders. You can use the Control key on Windows, or Command key on Mac, to select non-consecutive files and folders. Now press Shift + Z and you’ll see an “Add to Folder” pop-up (see screenshot). Next select the folder where you wish to add the selected files and click OK.
That’s it. You have neither copied nor moved the files to the destination folder, you’ve merely created references or aliases to files inside the other folder. You can use the Shift+Z keyboard shortcut again to add the selected files to any other folders in your Google Drive.
This little feature will come handy in several cases. For instance, if you have a folder of pictures inside Google Drive, you can use Shift+Z to place some of these pictures into another shared folder. You need not create duplicate files in your Drive and if you remove a picture from the parent folder, the file is gone from other folders too.