For the apk it is asking for permission so it can save to your phone so when the next update comes out and you install the new version you dont have to start a new game.
thanks for the reply bro i wont lie that message genuinely concerned me lol, i have too many personal photos, videos, and files i wouldnt want some stranger to have access to, with all due respect. but the game does look amazing. ill have to get another device to play this on. i appreciate you taking the time to respond as i was genuinley curious. i hope you have a good day. cant wait to play and support your game!