Layers not showing on timeline or when i preview the file

I am setting up a slide that has 4 Audio tracks and a layer for each track. So here is how it is set up:

Audio 1 - Base layer

Audio 2 - slide layer 2

Audio 3 - Slide layer 3

Audio 4  - slide layer 4

I set up triggers to have the layer show when the audio of each layer starts, by I am getting only a blank slide...Also the layers are not showing on my timeline. Can anyone help?

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