Dropbox keeps a cache of files hidden in your Dropbox for efficiency and for emergency purposes. If you've deleted a lot of files from your Dropbox but the file size has not changed to reflect the deletions, the files you deleted may be kept in your cache folder.
Your cache folder is automatically cleared every three days. If you need to delete sensitive files immediately or need to clear up some space on your hard drive, you can manually clear the cache by following these steps:
Dropbox for Business users: If you have two accounts linked to the same desktop, the name of your Dropbox folder will be appended with your team name in parentheses or “(Personal),” depending on the type of account. Here’s how it would look to clear your cache on a Dropbox for Business account called “Pepo Inc”: