UnauthorizedAccessException in ExternalStorage

[magicbot]

Here is a post that might be related:

Access denied writing files on USB

It sounds like you’re running into Android’s scoped storage restrictions, which got stricter starting from Android 10. Even if your USB drive mounts under /storage/XXXX-XXXX, Android often treats it as external storage, meaning standard permissions alone (READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE) aren’t enough. I’d recommend looking at this repo UnitySimpleFileBrowser —it uses Storage Access Framework which should resolve the ‘access denied’ error you’re facing.

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I recommend looking at these open source projects to see how to read and write files outside of your app’s local directory.

GitHub - yasirkula/UnityNativeFilePicker: A native Unity plugin to import/export files...

GitHub - yasirkula/UnitySimpleFileBrowser: A uGUI based runtime file browser for Unity 3D...