Hi Nasser, you are not using the copy_images extension. You cannot select make4ht extension using TeX4ht options as in "mathjax,htm,nostyle,copy_image". You need to add it to the -f option of make4ht. So the correct call is:
$ make4ht -ulm default -f html5+copy_images foo.tex "mathjax,htm,nostyle" To confirm that an extension is used, you can look for this message at the beginning of the make4ht run, with the -a debug option: [INFO] mkutils: Load extension copy_images Best regards, Michal