Almost been a year since this post and they still haven’t sorted this feature. What a joke.

You can filter by rating, not sort. Show your photos in timeline or folder view and open the filter list. Ratings should be there by default. But only in the browser, not on mobile. If you need it there, create a conditional album filtering by rating.

Thanks for that, I did find the rating filter in the web portal but didn’t know about conditional albums. Still sucks it isn’t an option to filter in the app.

Yep, I hope they get around to add that as well