能挂载外置sd卡但不能写入文件，显示权限拒绝，实际上权限都给了

<img width="640" height="1080" alt="Image" src="https://github.com/user-attachments/assets/049cf185-b0dd-4701-b532-004b9ef8bc6b" />

![Image](https://github.com/user-attachments/assets/b8621683-3cc0-48da-b671-c2c94274762b)

系统是原生安卓9.0 已root