Nokia is using stock Android and it is up to you to download any file manager you want. The play store has thousands of file managers to choose from as well as photo gallery apps. The Google photos app is the default photo gallery. You do not need Nokia to provide these things.
Nokia is using stock Android, it's a good sign but have you ever observed that either you want or not your all pics & videos are updated in drive silently without any notification or your permission. I had no problems if Nokia provided any drive options their own. But those who knows a little about Google drive, it also silently upload it in your Google+ news feed if you haven't signed out there. Same in play music. Nokia is a name of trust and they needs a huge modification of their OS otherwise their customers will throw Nokia again @MikeG