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No, it's not what is being talked about. It's about thumbnails where you can see multiple of them at once.

Interesting, I get that preview in Firefox but not in any other standard file picker on my system. Any idea why that could be?

That said, the preview is absolutely tiny and takes up a lot of horizontal space so it still feels very suboptimal. I much prefer the way Windows does this (https://ibb.co/jvQ50MG); you can play around with the old Windows file picker over at [1] and I must say that I would happily use this file picker for picking images in GNOME if I had the option.

[1]: https://bellard.org/jslinux/vm.html?url=win2k.cfg&mem=192&gr...

> Any idea why that could be?

It's not a default thing (I don't know why), apps need to add a couple of lines to use it. Relevant lines in Firefox: https://github.com/mozilla/gecko-dev/blob/master/widget/gtk/...

Something like this https://wiki.installgentoo.com/images/b/b9/Gloriouskdefilepi... is what people are requesting