Also, I am not sure you can automatically expect the output of the find command to be assigned to the file variable. I would output the find command to a temp file, and then grab the filenames one by one from the file and then put that in a do/done loop. Eg:

    
find ./ -type f \( -iname \*.jpg -o -iname \*.png \) > yourtempfile.tmp    
for file in `cat yourtempfile.tmp`     
do     
    echo "in loop"    
    echo "$file"    
....     
done

  

Here are some results I got when it ran:

in loop./Figs_XSR900.JPG'.'/'Figs_XSR900.JPG'Renaming ./Figs_XSR900.JPG to ./356bb549-d25c-4c9b-a441-f8175f963c8cin loop./20240625195740_411A6199.JPG'.'/'20240625195740_411A6199.JPG'Renaming ./20240625195740_411A6199.JPG to ./3cc9ba51-1d15-4a10-b9ee-420a5666e3e2