I think Fandom hasn't added that function in yet. For now, you will just have to customize galleries using source mode. Also note that there are a few cases where galleries don't obey the options you give them. I can't recall of the top of my head what those cases were.
the problem is that adding images from the gallery is slow to update with respect to new images, and i'm posting and doing it, besides that i need to see the photos to select the ones that interest me and he only lets me select the ones that i type in the name , I'm even working with a different method, but it would be less work if the wiki fixed this inconvenience.