Total Commander

On my Nokia Lumia 830, I can select files, but it is not possible to copy or to move them to an other folder. It seems that a button is missing.

Don't you have this button? Image: http://cdn01.trixum.de/upload2/31800/31767/2/26926f4e737e74bdb0f537fda033cac47.jpg
Can you post a screenshot?

Total Commander is a (virtual) two panel file manager. Before you can copy, you need to swipe sideways to see the other panel. Then set the target directory there.