The photos in a gallery can be rearranged in two ways:
1. You can change the order of the images by dragging and dropping them on the visual design section of the builder. This works well if you are moving an image close to where it is currently located and visible on the screen.
2. The other way to change the order, is to click on the cog icon next to the Gallery in the Layout Sections area. This will bring up the gallery settings dialog where you can easily select any of the images and drag it to the position you want it be. Here is what the gallery settings dialog looks like:
You can also select sort on upload which will sort the gallery automatically by name once the image uploads have completed.
keyworks: sequential sort order