A:AnswerNo, you really have to look at it in the shade without sunglasses. This happens with my phone too, it's just the way these things are built these days.
A:AnswerSadly nope.
However, you can use AudFun Spotify downloader to download Spotify playlists to mp3 and then you can listen to Spotify on this mp3 player.
AudFun really does a good job!
https://www.audfun.com/spotify-music-converter.html
A:AnswerI don’t think so since you need to connect it to a USB. You’d have to share your files maybe on google drive and then downloaded once you use a computer.