Do you know which samba protocol version(s) your router supports? Most Linux file managers currently relied on using the now deprecated NetBIOS discovery (SMBv1 runs on NetBIOS as well). This is best left disabled for security reasons. However KDE’s Dolphin file manager has recently gained the ability to use WS-Discovery for servers that support that mechanism.
Assuming that the router supports avahi service discovery, see if you can reach it via a .local name…
ping inteno.local
avahi-browse -art
If inteno.local is enumerated in the avahi-browse output, try
smb://inteno.local/usb
or via it’s IP address if that fails eg
smb://192.168.1.1/usb/
Is the firewall active?
sudo systemctl status firewalld
and if it is, check that samba and avahi allowed?
firewall-cmd --list-all