CR3-RAW-Thumbnail-Image
Thumbnails for CANON RAW images in Gnome Files (Caja/Nautilus)
Tested on Linux Mint 20, Ununtu 20.04, Ubuntu 16.04
install
apt install libimage-exiftool-perl # need 11+ version
apt install gridsite-clients
copy files your system
chmod 755 /usr/local/bin/cr3-thumbnail.sh
See mime type
file --mime-type Your-file.CR3
answer most bee in file /usr/share/thumbnailers/cr3-thumbnail.thumbnailer
MimeType=application/x-extension-CR3;application/octet-stream;
reload
rm -r ~/.cache/thumbnails/*
caja -q
or
nautilus -q
And open folder
debug
tail -f ~/.xsession-errors