Gallery on Hudl2?

First things first. A merry Christmas and happy new year to all in the background at how to mend it and all members/participants in the various subjects.
On my PC I created two ‘Master’ folders each having various artist video’s. Folder 1. Is ‘Drawing Tutors’ Folder 2 is ‘Oils Tutors and have loaded both on to my hudl2 SD card memory(32GB). There are six video’s in each of the ‘Master’ Folders but when opening ‘Gallery’ on the hudl2 each master folder name Is not showing but all six tutor videos of each subject (12 in total ) are showing.
What I wanted or thought would happen each master folder would show so would see only 2 folders then click on each Master folder as required to select a particular video. Is this possible ? I have Es file explorer but again their all over the place. It would be much tidier if I were able to have only the master folders shown un opened.

Many thanks Charlie 2