This command adds a password that will be attempted whenever a master password would be needed to decrypt the credentials.
Different stored data might have originally been protected with different master passwords.
In this case you can add multiple passwords by using the secret command multiple times.
If you have configured to save passwords protected by a master password you’ll be prompted to enter
the master password in order to decrypt credentials when connecting. If a password is provided in
the connect command it will be attempted first.
Note: You can use this option in a script file to use stored OAuth tokens without getting prompted to enter a password.
The video tutorial below shows the password options of FileZilla Pro CLI.