I found a simple way, but I need a little help in the last part.
Imagine that you want to make a contest about CodeWeek photographs from local schools.
1) each teacher (standard user) adds pictures in a new personal album called "CodeWeek2016"
2) change each photograph by placing a description, tags and the category = "Coding - CodeWEEK2016" (specially created by Admin)
3) all teachers (each standard user) can select "Photos / Categories" and choose the category "Coding - CodeWEEK2016" to display all photos uploaded relative to this contest, so he can display each photo and vote for those who prefer (1 to 5 stars).
Now it seems there's a little bug: I can not view photos of that category ordering by votes (rating).
If I choose "Photos / Categories" and "order by: Popular" I have no sorting order. I get the same result that "order by: None" or "order by: Recent (and I think also that "Popular" should displays ordering by "how many times a photo is displayed" and not ordered by rating).
Is there a workaround using an URL with a sorting parameter?
For example:
http://yourdomain/m/photos/browse/category/Coding% 20-% 20CodeWEEK2016
can also accept a parameter to sort by popularity or rating?
Or better:
http://yourdomain/m/photos/rate
can also accept a parameter like "category=Coding% 20-% 20CodeWEEK2016" ?
Andrea