Here's a quick tutorial on editing the photo gallery in Wix. Covers reordering images in Wix galleries, as well as titling and descriptions for images, adding images, and settings so that when you add images in a Wix gallery, it will add them to the beginning, the end or after the selected image in the gallery so you don't have to do a lot of clicking and dragging to reorder new images added.
P.S. This is from an local Denver artist's website, check out her amazing work: joyce4972.wixsite.com/joyce/
P.P.S. The Site History backups didn't load fully when I was recording this, sometimes it takes a little time to load as it's loading so many saved versions of the site.