I'm having the issue firstb0rn posted. I have 5 images attached to a post: a feature image, a slider image (image displays in hero slider on home page and links to this post), and 3 photos I would like to display in a slideshow embedded in this post. I would like to hide both the feature image and the slider image. I have the "Exclude featured images from slideshow" box checked in Settings, which is successfully hiding the feature image, but I do not see a checkbox in the Media Gallery to exclude other images from the slideshow.
I tried using the shortcode [portfolio_slideshow exclude=" "] but I haven't been able to get that to work either. What is the attachment ID that I should be specifying? I've tried using the image file name, the attachment post URL, and even the image's order number. Any idea what I might be missing here?