Button sounds on Storyline buttons vs graphic buttons

I have a quirky problem. I am adding button click sounds to buttons creating using the Storyline buttons as well as some clickable graphics that I created myself. (Using the standard "Play media" triggers.)

When I preview slides individually all the sounds within the slides play fine.

When I preview the entire project, only the sounds added to my original graphics play and none of the sounds triggered with Storyline buttons play at all.

Any ideas?

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