Create a gallery
“Add Media” > “Create Gallery”
Check off the photos you would like to be included in your gallery and click “Create gallery.”
From there, you’ll see a screen that will allow you to determine how you would like your gallery to look.
In this example, I have added captions to each image, set the image links to “media file” so that the images will expand when clicked, and specified that my images should be medium-sized and arrayed in two columns.