Storyline - checkboxes and images states - hidden / Normal

Hi there,

I have a list of checkboxes + hidden images on a slide.  When the learner tick a checkbox, the linked image have to show up. If he decide to untick the checkbox, the image have to disappear again.

I did all the process, " change the state of the image 3 to normal when the state of the checkbox 3 is selected". However, I don't know how to make this image on hidden state again... I tried a trigger : "change the state of image 3 to hidden when leaner click on checkbox 3" but it's not working, the image didn't show up at all...

Let me know if you can help me

Thanks !!