How to blink next button of storyline player when the timeline end of the slide.

Hi, I am just now to storyline 360. and I am trying to find out about the flashing next button. I have seen the "flashingnextbutton.story from Russell (3years ago) and I have tried to do exactly the same. what i mean is that I have set-up below: 

• layer with another colered button
• on the layer arrange a trigger with hide the layer, when timelines end
• on the layer arrange a trigger with show the layer, when timelines end
• on the base have a trigger show the layer, when timelines end
• inserted animation fade 0.75s and fade out 0.75s on the layer button. 

when playing the slide, It show the layer when base timeline ends, but it only flashes one time then it stops. 

Hope anyone can guide me in the right direction.