How can users "own" there own files in somone elses folder?

I am hosting a picture hosting service where me “user1” is creating a folder “new year 2020” event ect.
in that folder other users make subfolders and upload there pictures to share.
I do this by giving all event-goers “create” access, and it works.
But all uploads is like owned by me, user1, how can I make people have there own profile with pictures for there own folders/files?

I have tested “Group folders”