I’ve added 2 gif images into the post to test the functionality. I went to Dashboard/Plugins/Garee’s Random Image and verified that the category ID I need is 645 and when I click on ‘show’ for the images of that category it shows the 2 images I expect.
I then added the shortcode [random_image category='645'] to the body of the Daily Inspiration page. When I tested it, I received the error message “Garee’s Random Image Error : No image found! (please check your category)” (you can see the error message there now, as I left the page live for diagnosis.)