At the moment, no, that is not supported. There is no easy way to restrict access to files and give them an expiration date unless I took away the ability for users to manage and access their own files. I would have to hide all of the files away under the private application data directory (which is still accessible on rooted Android devices) and prevent the ability to export those files. Adding all of the code that would be necessary for this would be a monumental undertaking, as it would also apply to things like the companion application. There is also no easy way to do that on Windows, as there is no concept of a hidden directory for me to hide things under, so unless I started storing the files inside a password-protected compressed file or something along those lines, I couldn't stop users from accessing them.
Mike
Mike