Play Media Files on Kodi 17.1

After many years of using Kodi to play my media files from USB external hard drives, I am now, after having installed Kodi 17.1 Krypton, at a total loss as to how to perform this function.
I am used to going to ” Videos” – “Files” – “USB”, then opening this and playing the video.
With Krypton I insert the USB – get a message about ES File Explorer, I ticked the Use by default box , from then on it’s total confusuion.
Any help or guidance much appreciated.