In addition, we explain what takes up the space
Google Drive storage being used but no files? (Solution)
Are you surprised that Google Drive says your account storage is full, when you know it isn’t? It looks like Google is right when it says so. Your Google account storage is used for all of your services, including Drive, Photos, and Gmail.
You may not have large files stored in Drive, but your Photos service may be using a significant portion of your storage quota. Similarly, you may have large files in the trash of various Google online services. You’ve deleted these files, but they’re still using up your space because you haven’t completely removed them from your account.
This guide shows you how to delete items in different services to free up space on your Google Drive.