If someone you don't recognize shares a file with you. If you received an email notification about a shared folder or shared link, Dropbox Help Center
Be wary of downloading .rar files from unknown senders, as they can contain malware like ransomware or trojans. Dropbox - 210.rar - Simplify your life
Use the Dropbox Help Center to learn how to create shared links or organize files efficiently. If someone you don't recognize shares a file with you