FTP, for File Transfer Protocol, is an ancient protocol that transfers files over an unencrypted connection. More telling, it’s little used.
Beginning with Chrome 81, Google’s browser will by default no longer support FTP. (This is something Google’s been working toward for ages.) Instead, IT admins should steer their charges to a native FTP client.
Customers can re-enable FTP support using the —enable-ftp command line flag or by enabling the FtpProtocol feature via the —enable-features=FtpProtocol flag. (For the latter, type chrome://flags in the address bar, press Enter or Return, then search for “Enable support for FTP URLs” and change the option at the right to “Enabled.”)