I use Tiny File Manager which I find excellent. I use ISPConfig and it's one of the few Control Panels that don't have their own file manager. I installed Tiny File Manager in my Dolphin root and called it manager.php. It's just a matter of entering https://dolphinroot/manager and it\s there. I suggested that ISPConfig add it to their script, but they said the licensing agreement didn't allow them to do so. As it turned out, the author of Tiny File Manager also uses ISPConfig and he saw my post. He gave them permission to use the script and said he'd change the licensing agreement as soon as he could. The script is a single 190k php file.