After installing BuddyDrive I figured that I needed "Enable BuddyDrive for groups on group creation".
So I went for the settings in the plugin line in the network admin plugin menu point.
It called up (correctly) this page:
After checking the checkbox, I tried to activate that setting by pressing "Save Settings".
That called the page:
But that page does not exist!. What to do?
The requested URL /wp-admin/settings.php was not found on this server.