1.  Click the play arrow.  This will load the 3-D viewer and enable a full set of interactive options.

2.  Move cursor over image.  This will enable the full set of commands for viewing the animation.  Including:

     Play the animation

     "Manually" rotate the image, view it from the top, view it from the bottom . . .

     "Manually" move to any point in the animation - as shown in on the play/pause line

     Click on a number to see the name of the bone.

3,  At the bottom of the screen the full range of commands are available, including full screen, speed of animation

4.  At the center bottom of the screen (viewable when the cursor is at that point) you may select specific bones for id.

5.  See the original at Sketchfab.