If I plug my iPhone into a public computer?

I was using a friends computer to look up some things today, and I plugged my iPhone in the USB port to charge. After about 5 minutes a window popped up and had pictures from my phone on the screen.
I exited the window quickly, I'm just wondering if this means these pictures are stored in my friends computer?
I didn't click on anything to download them.

No not in less you uploaded them with iTunes

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