Integrating file management with Organic Groups
Partial answer is that CKFinder doesn't integrate with OG out of the box, or easily at all. They do offer an access control list, but you would need to know the specific directories and specific people who need access. It won't work to create folders/permissions on the fly when creating groups or add/remove permissions as members are added/removed to the group. They mentioned that a custom plugin may be possible to do to modify the access control list but that it would be quite a bit of work. Java was recommended for the custom plugin.