Why is there no way to password protect the Dropbox Paper mobil app? I mean are you kidding me? I really wanted to use this app to keep passwords so I could go from desktop to mobil and quickly look up a password or some other secret document but to my surprise, after initially setting up DB Paper, it opens right up to my save secret document. the Dropbox app has a 4-digit password, how freaking hard would it be to put that in the Paper app?