Images can be inserted individually or as a group in a gallery. To show photo gallery, here's how:
1. Attach photos. If they are inserted in the body of message, erase them. In other words, photos are attached but not inserted.
2. Click on "Image Gallery" menu icon.
3. Image Gallery window appears. Select photos that you want to include in the gallery. Then click "Insert".
4. Now your gallery is included in the post. Click on "Submit" to finish posting.
5. Your photo gallery shows up.