Note:
Please make sure your router-connected Ethernet cable is connected to internet.
USB Port:You can connect USB peripherals like hubs,audio/MIDI interfaces ,card readers for CompactFlash ,SD,micro SD,and more.
Note:
The picture files need to be saved in named "DCIM" folder. The digital camera can create "DCIM" folder automatically.
But if USB flash disk. You must create "DCIM" folder and copy manually. Apple only allows current less than 100mah for devices so please make sure your USB device power is less than 100mah, otherwise it will not work.
If iOS 13, can import & export transsfer Photos,Video,MP3 files,Excel,Word,PPT,PDF by open the 'Files' App.