模型中的项目不会在View中实时更新

In my project, I have a view where a user can see ImageCollections which have subfolders and images (set up through MVVM and models). One of the features I wanted to implement is a little image holder where the next image unseen yet is displayed. I have set it up in the ImageCollection model below and it works a treat BUT: it does not update in real-time.In my project, I have a view where a user can s