How to receive shared images on Andoid and iOS?

Adding the app to the sharing list was easy: I just put this into the android manifestAdditions on my application descriptor:

<application>
  <activity>
    <intent-filter>
      <action android:name="android.intent.action.MAIN" />
      <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
    <intent-filter>
      <action android:name="android.intent.action.SEND" />
      <category android:name="android.intent.category.DEFAULT" />
      <data android:mimeType="image/*" />
    </intent-filter>
  </activity>
</application>

I was expecting to receive ionformation about the shared picture from the InvokeEvent when the app was started by the sharing event, like this:

NativeApplication.nativeApplication.addEventListener(InvokeEvent.INVOKE, onInvoke);

And

private function onInvoke(evt:InvokeEvent):void
{
  // process the event here to get shared imga info
}

However the received InvokeEvent does not come with any info about the picture...