Why even after deleting duplicate files from Google Drive, the space hasn’t regained?

Remo Duplicate File Remover App would identify the duplicate files on your Google Drive and you need to delete them from your Google drive. These deleted files would be moved to the Trash folders and are available for you to recover them if you need any of the files back. If you wish to regain the space, please proceed to empty your Trash. Once your trash is emptied, you would get back the extra occupied space.

Check this FAQ link on how to empty the Trash: How to empty trash from Cloud storage?

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