Context: Fedora/Bazzite/Kinoite/universal-blue/KDE/Flatpacks
When using KDE applications (like Okular or Gwenview) installed as Flatpaks in Fedora KDE Bazzite or other containerized Linux distributions, they may fail to open remote files (like those on Samba shares) when launched from Dolphin File Explorer.
Example error from Okular:
Could not open smb://... Reason: Unable to create KIO worker. Unknown protocol 'smb'.