Help me. I cannot get the information of who shared those photos

[ferhat.ismayilov097]

Consider an application with multiple events. Everyone knows to share photos in every event. i did it up here. I can get the information of who set up the event. but I cannot get the information of who shared those photos. I think I should create a database in database. but i have no idea please help. you will understand better in the photo.

[ualdir]

Since the users are logged each Database table have the field creator.