This is really frightening, because all the pdfs I have made on my Mac are visible because they are linked to the Document Cloud. I can't see that there is any security on the App and a lot of my pdfs are business confidential. Any one know how to make this App secure like Dropbox with a passcode? Not that Adobe could get hacked or anything. Oops they have.
If you don't want to sync files across devices please turn off Mobile Link feature in the app.