thank you, Victoria.
i would like to mention that it’s also not previewing either CR2 nor RW2. only thumbnails i get are for pdf, video and jpg.
update: finally got it to work:
-
installed tumbler and tumbler-extras per advice found elsewhere
-
followed instructions at GitHub - emuskardin/nautilus-raw-thumbnails: Preview RAW files in Nautilus
-
rebooted
now i have thumbnails of everything.
posted this solution in the new issue i’d opened.
thank you again Victoria and others for sharing and commenting on this issue.