Security researchers used a honeypot approach to discover that Dropbox opens some files once they’re uploaded. Dropbox has automated backend processing to generate previews of certain file types. Dropbox assures users that only a small handful of Dropbox employees are authorized to access customer data. The fact that an unauthorized third-party is accessing that sensitive data is a problem. Ultimately, it comes back to the fact that Dropbox should not be used for business. It is a consumer-oriented service, providing consumer-grade protection.”]
Source: https://www.csoonline.com/article/2137123/dropbox-is-peeking-at-your-files.html