Hello,
Unity Editor version: 3.10.0
ML2 OS version: 1.11.0
Unity SDK version: 2022.3.9
Host OS: Windows
I’m developing a Unity app for Magic Leap 2 and encountering write permission issues when trying to create a folder on a connected USB drive. It seems the USB is mounted as internal storage, but I’m getting ‘access denied’ errors. I’ve already modified the AndroidManifest.xml to include READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE permissions (even if USB is under /storage/XXXX-XXXX), and adjusted the Player Settings in Unity. Has anyone else experienced this, and are there specific APIs or workarounds recommended for writing to USB drives in this configuration?
I can read and copy files from the USB device…
Many thanks 
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.
I’ll give it a try, thanks!
Edit: Even using UnitySimpleFileBrowser and its handlers, it still gives me permission denied
We use the standard Android 10 storage access so the only thing I can think of is that something with the API or Storage Access Frame work is not configured correctly. Note that even when using SAF you won’t be able to use a traditional file path like /storage/xxx-xxx Instead you will need to use the URI (the path returned by the system)
You may be able to access / create directories with SAF by adding android:requestLegacyExternalStorage="true" to your manifest.