Dear Valued Customer, This is the most frequently asked question to us.

Internet Explorer browser does not support multiple upload functions on any version of it. It is not only WHMSonic, any multiple upload on the web is not supported by IE. This is the standart issue of an internet explorer browser from microsoft as default not WHMSonic. We highly recommend "Google Chrome" or "Fire Fox" for WHMSonic or you can use them for just multiple upload feature.

You should inform your clients if they are not aware about IE multiple upload features.