Run the bash script fzf-preview.sh.
This chooses an image viewer and calls fzf with preview script fzf-file2preview.sh.
fzf: junegunn/fzf
ueberzugpp: jstkdng/ueberzugpp (suggested)
Alternatives:
ueberzug: ueber-devel/ueberzug
chafa: hpjansson/chafa
catimg: posva/catimg
Also works within a kitty terminal employing kitty icat.
audio: ffmpeg, exiftool
djvu: ddjvu
epub: epub-thumbnailer
pdf: pdftoppm
video: ffmpegthumbnailer