Could you please be a bit more specific on this? For me, the scenario in which you are using the carousel is not 100%. Are you using a persistent object? Does the object show up when configuring the bootstrap carousel, or not at all?
There are two things where I can think off. If the object does show up, but you can't see the images, it may has to do with your domain model security settings. If this is not the case, it may has to do with the direction/owner of the association you are using.
Please let us know if these hints solved your problem. If not, please share some more information/screenshots so we can have a look again.
I responded to your other thread here: https://forum.mendix.com/link/questions/87312