Ah the journey to change it into a portable file/media server.
1> I had a similar problem with my USB, first check to see if you can see the files listed on the web interface under Home>(usbdrive) if you can see your files there and click on them to download then at least we can say thats working. At first i could not view the usb drive on the windows network, this was due to the fact my windows file and printer sharing was broken and would not stay on no matter how many times i tried… i had to go into windows > settings > Network and settings : Reset Network to get it to turn on. Anyway if you have an android phone you could always try something like es file explorer then open the ip of the router to see if the files are shared on the network, not sure what else to tell you there, good luck?
2>GL-MT300n-v2 as DLNA media server: Hoo boy, not built in, but the link posted by Kyson-lok is the softwear yoou need to do it… as for installing it. I THINK this is the process… but could be wrong.
Also you will need softwear to SSH into the router and file transfer to it, there may be easier ways but i used Putty and WinSCP to do it.
Anyway steps as follows: Transfer the LPK Kyson-lok linked to your router, i suggest into the tmp folder.
SSH into the router and log in with your username and password (usually root and whatever password you set as admin when setting up your router)
First make sure your up to date with your lbs by running “opkg update”
Once that’s done (assuming you get no errors) you should be able to run the lpk by inputting “opkg install /tmp/minidlna_1.1.5-3_mipsel_24kc.ipk”
… okay then you need to instal the luci interface so run “opkg install luci-app-minidlna”
and then we want it to run the dlna every time the router loads so run “/etc/init.d/minidlna enable”
and the turn it on “/etc/init.d/minidlna start”
after that it should be on your network… i think… i may have missed a step.
ether way hope some if not all of this helps, if not… eh, im not the best to ask as im really a novice at this.