How do I delete the default images when I plug my USB thumb drive into my FireTV?

I have a Kingston USB thumb drive and every time I plug it into my FireTV there is like 100 images that show up that I don't know what file folder or where they are. How do I get rid of them? I tried deleting the "Android" and "LOST.DIR" files and making a new file with those names to block them. I just want my images and ONLY my images to show up when I plug my external storage devices into my TV. Can someone help me?