Thumbnails don't show up on file upload menu, unless

Hi all. Using ZORIN 18.1 I had a trouble at first. Thumbnails showing fine in nautilus, but won't show when trying to upload from website. Well, I find out a way to do it. If I open folder in nautilus first, showing all thumbnails, then open same folder on website, it shows all thumbnails OK. My question is, do I always have to open folder in nautilus first, or is there some way around it, so thumbnails will show on web upload, without opening them in nautilus first?
Appreciate any input

It only works this way as far as I know. The filepicker which you see when you upload files to a website doesn't has the same functionality as nautilus.
In higher gnome versions from gnome 47 onwards that may have been changed but not in gnome 46.

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@Forpli gave you the right answer.