To locate your external storage:
Once a USB or Micro SD card is inserted, tap or click the notification that appears in the upper-right corner of the screen. You may also go to Desktop tile and click on File Explorer (the folder icon) to find your external storage.
To transfer files/image in your external storage:
Go to the Desktop tile and open the Documents folder on the task bar to locate the folder where the file is saved. Select and hold on the file to bring up a drop-down menu. Click “Copy,” then access the external storage folder within “This PC” on the left pane. Select and hold down on any blank area within the folder and choose “Paste” to move the file into the external drive.