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The LeTV Le 1s was one of the first smartphones with USB Type-C and if you want to move large movies or videos, the Kingston DataTraveler microDuo 3C is convenient to use.  

With USB Type-C, you don't have to worry about the orientation of the the connector.  You can plug the Kingston DataTraveler microDuo 3C one way and then flip it around and it connects again just fine with the LeTV Le 1s.

To move files around the LeTV Le 1s and the Kingston DataTraveler microDuo 3C, just go to File Manager on the home screen and select the file(s) you want to transfer.  In this case, I selected a large video file.

  

Just hold your finger down on the file and you should see icons below to copy, move, upload to the cloud, or delete.  I selected the move icon and was brought back to the Phone storage root folder.  To move to the Kingston DataTraveler microDuo 3C drive, select the back arrow and then select 'usbotg' to access the Kingston USB drive folder.

  

Once you have selected the folder you want to move the file to, select 'Move to' on the bottom.  The large video file moved within a second and I was automatically brought back to the folder that I moved the file from.

  

After I went back to the File manager home screen, I could select External device (which is the Kingston DataTraveler microDuo 3C) and confirm that the video had been moved to the right folder.

  

If you want to remove the USB drive, it's best to first safely unmount it.  Go to the LeTV Le 1s's System settings -> Storage, and towards the bottom you will see the External USB storage section.  Select 'Unmount USB storage device' and confirm you want to unmount.

  

After a few seconds, the USB storage will be unmounted and you can safely remove the Kingston DataTraveler microDuo 3C from the LeTV Le 1s.

  

The LeTV Le 1s only supports USB 2.0 (480 Mb/s) but using the Kingston DataTraveler microDuo 3C is still much faster and convenient than having to transfer large files wirelessly.