How to display newest picture on dashboard or show the 5 images changed every 30s in dashboard?

Hello everyone. I'm a newbie in Node-Red but I would use the Node-Red to do my Thesis.
I want to make a system simulation on node-red. I want to display the newest picture on a dashboard, when I click something the node will choose the newest photo in my file(such as My Pictures) and then show on the dashboard. please help me T-T

Thank you.

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