1) If the ND2901 is connected and detected properly, the Smart Device alarm about it. Tap that alarm or execute 'My Files' App.
2) Move to '/Storage/USBDriveA/' on the 'My Files' App. That is the root folder of ND2901.
3) Move to the 'NEXTOMS' folder. You can find date coded backup folders.
4) You can see the JPEG file directly, while need to use other App to view RAW files.