If you want to change the Secondary logo for Openemr
Put your logo in: var/www/localhost/htdocs/openemr/sites/default/images/logos/core/login/secondary
If you want to change the Secondary logo for Openemr
Put your logo in: var/www/localhost/htdocs/openemr/sites/default/images/logos/core/login/secondary
To do it in docker from c:\logo.png from windows
docker cp c:\logo.png openemr:/var/www/localhost/htdocs/openemr/sites/default/images/logos/core/login/secondary/logo.png