Hi cbx200,
I do not know which router you have, I have the “GL-MT300n-V2” with the new firmware v3 update. If you add a USB Stick or USB drive with multimedia files like videos, I think it will automatically mount the drive and set them as shared for wired connections (share via lan), and you can go into the router’s menu Applications - File Sharing and enable Wireless sharing (share via wan) as well. I also added the minidlna application plugins (minidlna, luci-app-minidlna, luci-i18n-minidlna-en (english)) to turn this mini router into a portable travel media server which works really well for me (see link below). After connecting the USB Stick or USB drive you may have to reboot the router.
My recent post
GL-MT300n-V2 firmware v3 update
This is what I had to do before the firmware v3 to get minidlna working with firmware 2.26
looking for dlna for gl-mt300n-v2
(Looking for DLNA for GL-MT300n-V2)
Have a good trip…
Phil (phd21)