To clarify, I should have said I copied the images there I never moved them by removing them. They’re still in their original place, “connection_images”. I also removed them from the new folder once I saw it didn’t change anything. So those images are all where they should be.
The broken image icon was there prior to updating Connections. I updated thinking/hoping it would fix the broken images. After the update, the images then showed blank placeholder images (as it is now).
I will look at the other thing regarding the theme conflict and report back.