Particularly looking at files app... So now allows USB drives and storage, do we now not need the lightning to SD/USB cables? Do they work on all iPad's not just pro south USB-C? I have a SanDisk lightning USB drive. Can I just use this anywhere rather than only in the SanDisk app? Can you now copy files to the iPad/iPhone internal memory for offline viewing? I use this for Dropbox when away or flying, to store docs, PDFs, scans of info required etc. If have movies on a USB stick can you play direct now from stick or still need an app to play? I'm thinking now don't need a larger Gb iPad for wife as she only uses it for basic tasks but when away I put some movies and TV episodes on. Again are all these available on all iPad's and iPhone's or just Pro iPad's with USB-C?