I don't see any dashboard actions?
That's the first thing.
The following issue is that you added an image to your dashboard.
You can't add a Filter - Action on an image.
Try to follow this article
Well i dont know if it doesnt carry them across or what when uploading them. They are there though.
I was following this tut on utube:
start watching at 29:30
I would still suggest to follow the link of Tableau.
It's a clear guide on how to add actions and create working filters.
Maybe you missed a small step in the tutorial?
they are not images. They are shapes downloaded and added to the My Tableau Repository folder as .png like the default shapes that come with Tableau. Your suggestion is fine and I tried that but I wanted a little more of a feel of a web page.