Does FTP packet capture work over the THM vpn?

I was doing the https://tryhackme.com/r/room/protocolsandservers room and for task 4 I thought it could be a fun idea to try and see if I can capture the ftp traffic on wireshark and find the credentials seeing as FTP is insecure.

I’m not sure how it works, does the VPN I use (I don’t ever use attackbox) encrypt the connection? For some reason no FTP packets showed up after issuing the command ‘ftp TARGET_IP’ and entering the username and password successfully.

Any explanation is more than welcome (detailed even more welcome).