Hello, I am totally new with the advanced functions of SharePoints. After some time of "Dropbox-alike" structure, an employee accidentaly deleted ALL files into a very important folder she also should not have benne able to acces (and apparently, by mistake another employee shared it with her). So now I've changed whole structure based on subsites, metadata and columns, thus willing to block any upload that is not files (deleting folders on upload/creation). I have tried to find a clear guide, but I could not find anything.
I am stuck in the beginning, straight after dropping the line with the subsite url. Should I put "Delete element" next or first I'd better add a control on file type? And what should looks like the syntax? Thanks