Manjaro 21.1.2
KDE Plasma Version: 5.22.5
Kernel Version: 5.14.0-0-MANJARO (64-bit)
Graphics Platform: X11
I’m having the same problem described here: RAW thumbnails on remote NAS
CR2 (Canon raw) files stored on Windows shares can’t be previewed as thumbnails in Dolphin. Doesn’t matter if the connection is wi-fi or wired. On the computer’s local drive Dolphin displays CR2 thumbnails just fine. And thumbnails for other graphics formats display fine both locally and remotely.
No problem opening remote CR2 files in Gwenview via Dolphin. Gwenview even creates and displays thumbnails that end up in the user’s .cache/thumbnails directory.
Briefly I thought I had it solved by doing what worked for Ubuntu. Adding the image/x-canon-cr2; mime type to the end of –
/usr/share/thumbnailers/gdk-pixbuf-thumbnailer.thumbnailer
and restarting Dolphin seemed to have fixed it but only temporarily for a directory of images accessed repeatedly. If that actually helped at all it didn’t persist and a batch of remote thumbnails that displayed yesterday are gone today.
Lastly, Dolphin is configured to skip remote previews with a very generous size limit.
Any ideas on what to try next?