Add optional thumbnails carousel on preview

[nissim-dev]

I have read the doc and I don't see an option to view thumbnails on preview, similar to Facebook image gallery that pops up on
images sent in conversations like the one below

Image Source

There is already a thumbnail carousel for the normal gallery, but I want to hide the thumbnails on normal gallery and instead show the thumbnail carousel on the preview/popup on the bottom.

Does it already have a feature like that? Maybe I have missed it?