Every guide for GalleryID. Each topic says who it is for and what it needs.
Users & access
Click any row to open the detail panel. Toggles and the role dropdown save on change. Display Name shows inline Save and Cancel once you start typing. Changing the role applies that role's template to the toggles below it, and the toggles refresh from the server right after the save.
This is the section that decides what a person can actually reach. A per-folder grant beats the user's role: an Editor with no grants sees nothing, and a Viewer with a Contributor grant on one folder can upload to that folder.
Expand the section
Pick a role per folder
Apply to subfolders
Remove access