docs: Update WRITE_EXTERNAL_STORAGE explanation

Clarify that this permission has no effect when an app's target SDK version is 29 or higher.

Bug: 251860134
Change-Id: I8adbc86976273d07b0698e4810bae59ddcbbbb6d
Test: built docs using go/abtd

1 files changed, 22 insertions, 7 deletions

diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index bc29e1995714..4ca481b64e45 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1134,7 +1134,28 @@
                 android:protectionLevel="dangerous" />
 
     <!-- Allows an application to write to external storage.
-         <p class="note"><strong>Note:</strong> If <em>both</em> your <a
+         <p><strong>Note: </strong>If your app targets {@link android.os.Build.VERSION_CODES#R} or
+         higher, this permission has no effect.
+
+         <p>If your app is on a device that runs API level 19 or higher, you don't need to declare
+         this permission to read and write files in your application-specific directories returned
+         by {@link android.content.Context#getExternalFilesDir} and
+         {@link android.content.Context#getExternalCacheDir}.
+
+         <p>Learn more about how to
+         <a href="{@docRoot}training/data-storage/shared/media#update-other-apps-files">modify media
+         files</a> that your app doesn't own, and how to
+         <a href="{@docRoot}training/data-storage/shared/documents-files">modify non-media files</a>
+         that your app doesn't own.
+
+         <p>If your app is a file manager and needs broad access to external storage files, then
+         the system must place your app on an allowlist so that you can successfully request the
+         <a href="#MANAGE_EXTERNAL_STORAGE><code>MANAGE_EXTERNAL_STORAGE</code></a> permission.
+         Learn more about the appropriate use cases for
+         <a href="{@docRoot}training/data-storage/manage-all-files>managing all files on a storage
+         device</a>.
+
+         <p>If <em>both</em> your <a
          href="{@docRoot}guide/topics/manifest/uses-sdk-element.html#min">{@code
          minSdkVersion}</a> and <a
          href="{@docRoot}guide/topics/manifest/uses-sdk-element.html#target">{@code
@@ -1142,12 +1163,6 @@
          grants your app this permission. If you don't need this permission, be sure your <a
          href="{@docRoot}guide/topics/manifest/uses-sdk-element.html#target">{@code
          targetSdkVersion}</a> is 4 or higher.
-         <p>Starting in API level 19, this permission is <em>not</em> required to
-         read/write files in your application-specific directories returned by
-         {@link android.content.Context#getExternalFilesDir} and
-         {@link android.content.Context#getExternalCacheDir}.
-         <p>If this permission is not allowlisted for an app that targets an API level before
-         {@link android.os.Build.VERSION_CODES#Q} this permission cannot be granted to apps.</p>
          <p>Protection level: dangerous</p>
     -->
     <permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"