Thanks, I also solved it a few hours ago by putting both sections, text and thumbnails in frames, but now I would like to know if I can title the page screens separately, Ex: page 1/Chapter 1 and page 2/Chapter 2
Viewing post in Easy Ren'Py Image and Replay Gallery comments
you could set up an if statement to check the variable gallery_page and display text base off of that, or if each page is for a specific chapter i.e. page 1 is chapter 1, page 2 is chapter 2; then
$ chap = gallery_page + 1
label "Chapter [chap]"
keep in mind gallery_page is 0 through (however many pages you have) and you must have 6 images only for the chapter .