Hey @Maurice!
Just an idea of how I have resolved this few times already. I have two Collections:
- Blog Posts
- Name (title)
- Photos (multi reference field)
- …
- Photos
- Name (title)
- Alt (Plain text)
- Photo Category (Option or single reference)
- …
Now on Blog Post detail page (the one that displays single collection item) I use Collection List that reference the multi-reference field connected to Photos.

Hope this helps
Cheers,
Bart