Hello @terrylau ,
Thanks for contacting our community.
Please test the following steps and send back the results:
1. It is recommended to confirm whether you can ping the router's LAN IP (e.g., 192.168.0.1) from the VPN client after the VPN server connection is established.
2. Please compare the FTP service test. Specifically, when accessing a USB device, replace the access address with the VPN interface address.
By default settings, the OpenVPN address is 10.8.0.1, and the WireGuard address is 10.5.5.1.

For further analysis, contact Local Support or email the test results, and prioritize upgrading the case accordingly.
You can send emails in the following format:
Subject: [Forum Escalation][ID 853030] New Firmware issue, unable to connect to router's SMB sharing by using Wireguard VPN server tunnel
Forum Nickname: terrylau
Thread URL: https://community.tp-link.com/en/home/forum/topic/853030
Model&Version: Archer BE230-v1-1.2.3
Description: