Permission to set permissions
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Go to Dashboard > System & Settings > Permissions & Access > File Manager Permissions
This is where permissions are set for the file manager - changing them on the Site Map as you do for other features, has no effect.
Note to developers: this action is far from intuitive for novice users. Suggest the addition of a note accordingly if the user tries to set permissions for the file manager from the site map.
then each section (composer/blog)page -> gets there own groups of who's allowed to be admin or not .. so 1 section could have a completely different set of admins from the next
its kind of cumbersome at first glance but well worth it in the end