Files does not actually produce thumbnails - this is subcontracted to the system thumbnailer over Dbus. I find .webm files (at least, elephants-dream.webm) thumbnails OK. However, .mkv are not yet thumbnailed although they are recognised by Files as a type of video file.
Files does not actually produce thumbnails - this is subcontracted to the system thumbnailer over Dbus. I find .webm files (at least, elephants- dream.webm) thumbnails OK. However, .mkv are not yet thumbnailed although they are recognised by Files as a type of video file.