Unexpected crash when opening Minecraft

After setting the storage location to "external", Minecraft will crash each time,in loading screen,when trying opening it.

Besides,though the storage permission has been given,it always fails to identity its flies in (/storage/09D8-578F/ ) Android/data/com.mojang.minecraftpe/

The system version of my phone is Android 8, with an SD card mounted, and the default storage location of my phone is the SD card.