This is somewhat expected. In Ubuntu 24.04 the file chooser dialog is
provided by GtkFileChooser, which supports querying existing thumbnails
but not generating new ones.
When you then open Nautilus the thumbnail is generated, and the file
chooser can show it.
In Ubuntu 24.10 and later, the file chooser dialog is provided directly
by Nautilus so it will be able to generate thumbnails on-the-fly.
For 24.04 and lower I'm afraid this is a Wont-Fix.
** Changed in: nautilus (Ubuntu)
Status: New => Fix Released
** Also affects: nautilus (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: nautilus (Ubuntu Noble)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/2106450
Title:
The Open dialog of apps, don't show thumbnails for just downloaded
files
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