Next button not showing after criteria met

Hello, 

I'm hoping a fresh pair of eyes can help with what is probably a very basic issue. Next and Previous buttons are not showing for me after the criteria has been meet on the slide. 

E.g. I have a main slide that links to 4 others, on return to the main slide even though the required states have changed to 'visited' the next/prev buttons are not showing. 

  • I have tried adding triggers for the state change, but this hasn't worked either. 
  • I have changed the settings so that when you return to the main slide it 'resumes saved state'

Perhaps I need the main slide to link to layers rather than different slides?

File attached 

TIA

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