Allow Admin to change all permissions on "Public" folder for My Cloud Ex2 and other NAS devices

Also, I would like to add one more thing which I believe to be loosly related.  But I would also like the ability to change where my photos are Auto Uploaded to or set permissions on the folder.  I really don’t need to have photos I have taken shown to anyone that logs in.  As well, as it stands now, anyone can delete those photos.  I would like to keep my photos completely private.