If you use a USB hard drive, make sure its file system is FAT32, exFat, NTFS or HFS+.If the USB storage device requires using bundled external power, make sure the external power has been connected.Insert your USB storage device into the router’s USB port and then access files stored there locally or remotely. How to access the USB storage device through the Wi-Fi Routers (case 1)?
If the USB settings interface looks different on your router, may refer to USB sharing settings vary according to different models.