StorageDirPermissions

Sets the permissions set on directories created in the storage directory.

StorageDirPermissions= permission_setting

Note that:

It is important that the webserver has sufficient permissions to both write and remove directories.
Settting the permissions to 0777 (read and write to all) is a potential security risk.

The preferred setting is 0770 (full read and write to user and group). This requires apache to have the correct user/group access.