I use the basic ssh
and sftp
because I learned how to use them long ago, and I find them easy to use.
But you may find it easier to use the standard file browser 'Files' alias nautilus
in standard Ubuntu. Click on the symbol with three horizontal lines and select 'Enter Location', and type the IP address. In a local network you can type
sftp://192.168.0.2
if that is the address to your server. If you open another window with 'Files' you can copy between the windows (if you have write access).
You can create a bookmark if you intend to connect to this address again. Click on the symbol with three horizontal lines and select 'Bookmark this location'.
In case you are using a custom port e.g. 1234
and want to connect directly to a specific remote directory e.g. /var/www/example.com
with the username someUser
then type:
sftp://someUser@192.168.0.2:1234/var/www/example.com
If you have problems also with 'Files', I think there is some other problem, maybe with the network or with some tool under the hood, and not with Filezilla.