Shortcode Insertion Shows Correct Path But No Image

I’ve tried using your shortcodes to display random images from folders within my site, but I’m only able to get the tiny question mark icon to display on the page. If I hover over the question mark icon, it seems to show the correct path to the image and each time I refresh the page the image name in the URL path changes to one of my test images. I’ve tried using the default path: wp-content/plugins/random-image-gallery-with-pretty-photo-zoom/random-gallery/ and also creating my own folders wp-content/plugins/random-image-gallery-with-pretty-photo-zoom/random-gallery/test/ and wp-content/plugins/random-image-gallery-with-pretty-photo-zoom/test/ and I even tried placing images in a test/ folder at the root of the site. I’d love to get this to work correctly, as it seems like the only solution to displaying random images exactly where I need them.