Can't save a chess game

[sjl872964789]

Describe the bug
First of all, thank you for developing this amazing application. I always failed to save the chess game before. After trying, I found that I had to open the stored permission first. Can you ask for the permission or at least prompt the user for the required permission when using this function

Device: [galaxy a6s]
OS version: [Android 8.1.0]
App version: [2.5.9]

Steps to reproduce the behavior
Download and open gobandroid
Start a chess game
Save chess

Screenshots
Recorded video see attachment
record.zip