diff --git a/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h b/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h
index 07815c6494411ba083595c1f45afc56cfff99c32..2c35fd42599c4c10fe39130c8059b4b246c5d332 100644
--- a/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h
+++ b/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h
@@ -61,10 +61,7 @@ FLUTTER_EXPORT
  */
 - (void)sendOnChannel:(NSString*)channel
               message:(NSData* _Nullable)message
-          binaryReply:(FlutterBinaryReply _Nullable)callback
-    // TODO: Add macOS support for replies once
-    // https://github.com/flutter/flutter/issues/18852 is fixed.
-    API_UNAVAILABLE(macos);
+          binaryReply:(FlutterBinaryReply _Nullable)callback;
 
 /**
  * Registers a message handler for incoming binary messages from the Flutter side
diff --git a/shell/platform/darwin/common/framework/Headers/FlutterChannels.h b/shell/platform/darwin/common/framework/Headers/FlutterChannels.h
index 9245d79a8ec6c9acf5fdf24494507bbf6bd920ae..83c9e989762e49e6a7567dfd3118ec056a557982 100644
--- a/shell/platform/darwin/common/framework/Headers/FlutterChannels.h
+++ b/shell/platform/darwin/common/framework/Headers/FlutterChannels.h
@@ -103,11 +103,7 @@ FLUTTER_EXPORT
  * @param message The message. Must be supported by the codec of this channel.
  * @param callback A callback to be invoked with the message reply from Flutter.
  */
-- (void)sendMessage:(id _Nullable)message
-              reply:(FlutterReply _Nullable)callback
-    // TODO: Add macOS support for replies once
-    // https://github.com/flutter/flutter/issues/18852 is fixed.
-    API_UNAVAILABLE(macos);
+- (void)sendMessage:(id _Nullable)message reply:(FlutterReply _Nullable)callback;
 
 /**
  * Registers a message handler with this channel.
diff --git a/shell/platform/darwin/common/framework/Source/FlutterCodecs.mm b/shell/platform/darwin/common/framework/Source/FlutterCodecs.mm
index b06dab7b85577f0c9261473c95b478166aa2b1f0..b55cf5277516bb79040029fc73ad9dc15e6ec072 100644
--- a/shell/platform/darwin/common/framework/Source/FlutterCodecs.mm
+++ b/shell/platform/darwin/common/framework/Source/FlutterCodecs.mm
@@ -73,7 +73,7 @@
 }
 
 - (id)decode:(NSData*)message {
-  if (message == nil)
+  if (message.length == 0)
     return nil;
   BOOL isSimpleValue = NO;
   id decoded = nil;
diff --git a/shell/platform/darwin/macos/framework/Source/FLEEngine.mm b/shell/platform/darwin/macos/framework/Source/FLEEngine.mm
index cfb6669cd74f7db801966701b66dab8c55fb4589..8d36532e098455dda648fcfde7d8dac8aabda164 100644
--- a/shell/platform/darwin/macos/framework/Source/FLEEngine.mm
+++ b/shell/platform/darwin/macos/framework/Source/FLEEngine.mm
@@ -345,6 +345,49 @@ static void OnPlatformMessage(const FlutterPlatformMessage* message, FLEEngine*
   }
 }
 
+- (void)sendOnChannel:(NSString*)channel
+              message:(NSData* _Nullable)message
+          binaryReply:(FlutterBinaryReply _Nullable)callback {
+  struct Captures {
+    FlutterBinaryReply reply;
+  };
+  auto captures = std::make_unique<Captures>();
+  captures->reply = callback;
+  auto message_reply = [](const uint8_t* data, size_t data_size, void* user_data) {
+    auto captures = reinterpret_cast<Captures*>(user_data);
+    NSData* reply_data = [NSData dataWithBytes:(void*)data length:data_size];
+    captures->reply(reply_data);
+    delete captures;
+  };
+
+  FlutterPlatformMessageResponseHandle* response_handle = nullptr;
+  FlutterEngineResult result = FlutterPlatformMessageCreateResponseHandle(
+      _engine, message_reply, captures.get(), &response_handle);
+  if (result != kSuccess) {
+    NSLog(@"Failed to create a FlutterPlatformMessageResponseHandle");
+    return;
+  }
+  captures.release();
+
+  FlutterPlatformMessage platformMessage = {
+      .struct_size = sizeof(FlutterPlatformMessage),
+      .channel = [channel UTF8String],
+      .message = static_cast<const uint8_t*>(message.bytes),
+      .message_size = message.length,
+      .response_handle = response_handle,
+  };
+
+  result = FlutterEngineSendPlatformMessage(_engine, &platformMessage);
+  if (result != kSuccess) {
+    NSLog(@"Failed to send message to Flutter engine on channel '%@' (%d).", channel, result);
+  }
+
+  result = FlutterPlatformMessageReleaseResponseHandle(_engine, response_handle);
+  if (result != kSuccess) {
+    NSLog(@"Failed to release the response handle");
+  };
+}
+
 - (void)setMessageHandlerOnChannel:(nonnull NSString*)channel
               binaryMessageHandler:(nullable FlutterBinaryMessageHandler)handler {
   _messageHandlers[channel] = [handler copy];