Hi, I’m not using either Group Folders or Access Control apps (just checked on apps), only the apps already installed in vanilla Nextcloud. When enabling certain user groups to edit or view a folder, I’m using the default web menu:

The approach of using a flat structure of folders doesn’t fit too well our organization. Typically we have cases like these (asuming hierarchical permissions/overrides):
Projects (r/w for Admin)
Customers (r for Sales)
Customer 1
Documents (r/w for Sales, r for Finance and Legal)
Brief (r for Tech)
Contract
Statement of Interest (r/w for Legal)
NDA (r/w Legal)
Memos (r for Everyone)
Design (r for Tech, r/w for the project manager)
Source (r/w for Tech)
Releases (r/w for Tech)