Hi Michael,
That sounds perfectly fine to me. With the conditional CSS loader the plugin will only enque a single CSS file, that is the instances file. The dequeue takes care of that, and you can sync the contents of the style.instances.css file, that will always contain all the correct CSS code the plugin needs. You can ignore all the other files.
I almost forgot the animations. I see the problem there as well. I’m seeing there is indeed a .gif file associated with this specific result, that should be animated. However taking a look at the source the image file displayed there is this one: {yoursite.com}/media/2019/06/11142653/chickadee-flight-sequence-w-feeder-test-1-300×375.gif
As you can see that is not animated. This is probably a wordpress resized thumbnail of some some sort. I’m not sure how wordpress handles animated gifs in general, or what it does, but it seems like this one is resized, taken only the first frame.
You can either try to change the plugin settings to use the full sized images when possible, or rather somewhere configure wordpress not to generate thumbnails of gifs, because without animation it is useless. Although I don’t know if that is possible without custom coding, or without using a plugin.