unity get data from external storage

1. Player Setting
   
2. Create Plugins/Android/AndroidManifest.xml
   
3. Modify AndroidManifest.xml

   <?xml version="1.0" encoding="utf-8" standalone="no"?>
   <manifest xmlns:android="http://schemas.android.com/apk/res/android" android:installLocation="auto"  xmlns:tools="http://schemas.android.com/tools">
     <application android:label="@string/app_name" android:icon="@mipmap/app_icon" android:allowBackup="false">
       <activity android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" android:configChanges="locale|fontScale|keyboard|keyboardHidden|mcc|mnc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|touchscreen|uiMode" android:launchMode="singleTask" android:name="com.unity3d.player.UnityPlayerActivity" android:excludeFromRecents="true">
         <intent-filter>
           <action android:name="android.intent.action.MAIN" />
           <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
       </activity>
       <meta-data android:name="unityplayer.SkipPermissionsDialog" android:value="false" />
       <meta-data android:name="com.samsung.android.vr.application.mode" android:value="vr_only" />
     </application>
     <uses-feature android:name="android.hardware.vr.headtracking" android:version="1" android:required="true" />
     <application android:requestLegacyExternalStorage="true"/>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" tools:node="remove" />
     <uses-permission android:name="android.permission.INTERNET" />
   </manifest>

4. For Oculus Quest2
   Storage Directory is

   “/storage/emulated/0/“