[file_selector] Update macOS README and example (#5034)

diff --git a/packages/file_selector/file_selector/CHANGELOG.md b/packages/file_selector/file_selector/CHANGELOG.md
index dde818d..65b3a64 100644
--- a/packages/file_selector/file_selector/CHANGELOG.md
+++ b/packages/file_selector/file_selector/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.8.4+1
+
+* Adds README information about macOS entitlements.
+* Adds necessary entitlement to macOS example.
+
 ## 0.8.4
 
 * Adds an endorsed macOS implementation.
diff --git a/packages/file_selector/file_selector/README.md b/packages/file_selector/file_selector/README.md
index 22ae707..863164e 100644
--- a/packages/file_selector/file_selector/README.md
+++ b/packages/file_selector/file_selector/README.md
@@ -7,8 +7,22 @@
 ## Usage
 To use this plugin, add `file_selector` as a [dependency in your pubspec.yaml file](https://flutter.dev/platform-plugins/).
 
+### macOS
+
+You will need to [add an entitlement][entitlement] for either read-only access:
+```
+  <key>com.apple.security.files.user-selected.read-only</key>
+  <true/>
+```
+or read/write access:
+```
+  <key>com.apple.security.files.user-selected.read-write</key>
+  <true/>
+```
+depending on your use case.
+
 ### Examples
-Here are small examples that show you how to use the API.  
+Here are small examples that show you how to use the API.
 Please also take a look at our [example][example] app.
 
 #### Open a single file
@@ -34,3 +48,4 @@
 ```
 
 [example]:./example
+[entitlement]: https://docs.flutter.dev/desktop#entitlements-and-the-app-sandbox
diff --git a/packages/file_selector/file_selector/example/macos/Runner.xcodeproj/project.pbxproj b/packages/file_selector/file_selector/example/macos/Runner.xcodeproj/project.pbxproj
index c84862c..c450a1d 100644
--- a/packages/file_selector/file_selector/example/macos/Runner.xcodeproj/project.pbxproj
+++ b/packages/file_selector/file_selector/example/macos/Runner.xcodeproj/project.pbxproj
@@ -26,6 +26,7 @@
 		33CC10F32044A3C60003C045 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 33CC10F22044A3C60003C045 /* Assets.xcassets */; };
 		33CC10F62044A3C60003C045 /* MainMenu.xib in Resources */ = {isa = PBXBuildFile; fileRef = 33CC10F42044A3C60003C045 /* MainMenu.xib */; };
 		33CC11132044BFA00003C045 /* MainFlutterWindow.swift in Sources */ = {isa = PBXBuildFile; fileRef = 33CC11122044BFA00003C045 /* MainFlutterWindow.swift */; };
+		6BA632E5BE2B856B0D473EBF /* Pods_Runner.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = C6D20B684858422917AB21A6 /* Pods_Runner.framework */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -52,9 +53,10 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		17DF935FF296A265D8BE378B /* Pods-Runner.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.release.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"; sourceTree = "<group>"; };
 		333000ED22D3DE5D00554162 /* Warnings.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = Warnings.xcconfig; sourceTree = "<group>"; };
 		335BBD1A22A9A15E00E9071D /* GeneratedPluginRegistrant.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = GeneratedPluginRegistrant.swift; sourceTree = "<group>"; };
-		33CC10ED2044A3C60003C045 /* example.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "example.app"; sourceTree = BUILT_PRODUCTS_DIR; };
+		33CC10ED2044A3C60003C045 /* example.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = example.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		33CC10F02044A3C60003C045 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		33CC10F22044A3C60003C045 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; name = Assets.xcassets; path = Runner/Assets.xcassets; sourceTree = "<group>"; };
 		33CC10F52044A3C60003C045 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.xib; name = Base; path = Base.lproj/MainMenu.xib; sourceTree = "<group>"; };
@@ -66,8 +68,11 @@
 		33E51913231747F40026EE4D /* DebugProfile.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = DebugProfile.entitlements; sourceTree = "<group>"; };
 		33E51914231749380026EE4D /* Release.entitlements */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.entitlements; path = Release.entitlements; sourceTree = "<group>"; };
 		33E5194F232828860026EE4D /* AppInfo.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = AppInfo.xcconfig; sourceTree = "<group>"; };
+		453A41FF685B9AACDF48F0C6 /* Pods-Runner.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.debug.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"; sourceTree = "<group>"; };
+		6FA96861AA2D76C12832F6C9 /* Pods-Runner.profile.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.profile.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig"; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = Release.xcconfig; sourceTree = "<group>"; };
 		9740EEB21CF90195004384FC /* Debug.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; path = Debug.xcconfig; sourceTree = "<group>"; };
+		C6D20B684858422917AB21A6 /* Pods_Runner.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_Runner.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -75,6 +80,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				6BA632E5BE2B856B0D473EBF /* Pods_Runner.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -99,6 +105,7 @@
 				33CEB47122A05771004F2AC0 /* Flutter */,
 				33CC10EE2044A3C60003C045 /* Products */,
 				D73912EC22F37F3D000D13A0 /* Frameworks */,
+				58708F6C9D1522F09C51DA54 /* Pods */,
 			);
 			sourceTree = "<group>";
 		};
@@ -145,9 +152,21 @@
 			path = Runner;
 			sourceTree = "<group>";
 		};
+		58708F6C9D1522F09C51DA54 /* Pods */ = {
+			isa = PBXGroup;
+			children = (
+				453A41FF685B9AACDF48F0C6 /* Pods-Runner.debug.xcconfig */,
+				17DF935FF296A265D8BE378B /* Pods-Runner.release.xcconfig */,
+				6FA96861AA2D76C12832F6C9 /* Pods-Runner.profile.xcconfig */,
+			);
+			name = Pods;
+			path = Pods;
+			sourceTree = "<group>";
+		};
 		D73912EC22F37F3D000D13A0 /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
+				C6D20B684858422917AB21A6 /* Pods_Runner.framework */,
 			);
 			name = Frameworks;
 			sourceTree = "<group>";
@@ -159,11 +178,13 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = 33CC10FB2044A3C60003C045 /* Build configuration list for PBXNativeTarget "Runner" */;
 			buildPhases = (
+				A778864BDDD7B12C41D66FBB /* [CP] Check Pods Manifest.lock */,
 				33CC10E92044A3C60003C045 /* Sources */,
 				33CC10EA2044A3C60003C045 /* Frameworks */,
 				33CC10EB2044A3C60003C045 /* Resources */,
 				33CC110E2044A8840003C045 /* Bundle Framework */,
 				3399D490228B24CF009A79C7 /* ShellScript */,
+				028A8DA36859BD4F05694F96 /* [CP] Embed Pods Frameworks */,
 			);
 			buildRules = (
 			);
@@ -233,6 +254,23 @@
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXShellScriptBuildPhase section */
+		028A8DA36859BD4F05694F96 /* [CP] Embed Pods Frameworks */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-input-files.xcfilelist",
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-output-files.xcfilelist",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
+			showEnvVarsInLog = 0;
+		};
 		3399D490228B24CF009A79C7 /* ShellScript */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
@@ -270,6 +308,28 @@
 			shellPath = /bin/sh;
 			shellScript = "\"$FLUTTER_ROOT\"/packages/flutter_tools/bin/macos_assemble.sh && touch Flutter/ephemeral/tripwire";
 		};
+		A778864BDDD7B12C41D66FBB /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-Runner-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
 /* End PBXShellScriptBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
diff --git a/packages/file_selector/file_selector/example/macos/Runner.xcworkspace/contents.xcworkspacedata b/packages/file_selector/file_selector/example/macos/Runner.xcworkspace/contents.xcworkspacedata
index 1d526a1..21a3cc1 100644
--- a/packages/file_selector/file_selector/example/macos/Runner.xcworkspace/contents.xcworkspacedata
+++ b/packages/file_selector/file_selector/example/macos/Runner.xcworkspace/contents.xcworkspacedata
@@ -4,4 +4,7 @@
    <FileRef
       location = "group:Runner.xcodeproj">
    </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
 </Workspace>
diff --git a/packages/file_selector/file_selector/example/macos/Runner/DebugProfile.entitlements b/packages/file_selector/file_selector/example/macos/Runner/DebugProfile.entitlements
index dddb8a3..d138bd5 100644
--- a/packages/file_selector/file_selector/example/macos/Runner/DebugProfile.entitlements
+++ b/packages/file_selector/file_selector/example/macos/Runner/DebugProfile.entitlements
@@ -8,5 +8,7 @@
 	<true/>
 	<key>com.apple.security.network.server</key>
 	<true/>
+	<key>com.apple.security.files.user-selected.read-write</key>
+	<true/>
 </dict>
 </plist>
diff --git a/packages/file_selector/file_selector/example/macos/Runner/Release.entitlements b/packages/file_selector/file_selector/example/macos/Runner/Release.entitlements
index 852fa1a..19afff1 100644
--- a/packages/file_selector/file_selector/example/macos/Runner/Release.entitlements
+++ b/packages/file_selector/file_selector/example/macos/Runner/Release.entitlements
@@ -4,5 +4,7 @@
 <dict>
 	<key>com.apple.security.app-sandbox</key>
 	<true/>
+	<key>com.apple.security.files.user-selected.read-write</key>
+	<true/>
 </dict>
 </plist>
diff --git a/packages/file_selector/file_selector/pubspec.yaml b/packages/file_selector/file_selector/pubspec.yaml
index 14ff929..c05900f 100644
--- a/packages/file_selector/file_selector/pubspec.yaml
+++ b/packages/file_selector/file_selector/pubspec.yaml
@@ -3,7 +3,7 @@
   directories, using native file selection UI.
 repository: https://github.com/flutter/plugins/tree/main/packages/file_selector/file_selector
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+file_selector%22
-version: 0.8.4
+version: 0.8.4+1
 
 environment:
   sdk: ">=2.12.0 <3.0.0"