It works OK in the Finder in Mavericks. However it's never been possible to upload this way and I never use the Finder for ftp. I would recommend Cyberduck.
How to connect to FTP on Mac computer via Finder · Access the Finder menu bar, and then select Go > Connect to Server. The Go Menu of the Finder. What is FTP? · How to connect to FTP on Mac... · Alternative third-party FTP Mac...
To access an FTP via macOS X's Finder application, first you will need to make sure File Sharing is enabled. Go to the Apple menu > System Preferences > Sharing.