Share as file on filesystem?

Various apps have a "share" functionality which opens up several providers of media/means to share some piece of content (e.g. send over WhatsApp and many others). Is it possible to have a "sharing provider" which simply saves the shared content as a file on the device filesystem? My main interest is sharing text, but not just that. I don't particularly care about the encoding/structural format - but do say something about that if you can.