Shared photos now can't delete

I grow tired of Apple changing previous permissions without the ability to revert.

Or maybe I don't see how.

Anyway, my business partner have a shared Photos album we use for all manner of photo sharing.

Before macOs and Photos v2.0 we were both able to share photos and either of us were able to delete and clean out the album.

It now seems like only the person posting can now delete which is annoying.

Is there a way around this, does anyone know?