How to select several files?

So i could either copy or delete them all at once? So far i can only see that i can copy/delete only one file at a time.

Use the SELECT MULTIPLE menu item.

Thanks! In my menu (russian) it says “edit multiple” , which i think is a bit misleading. 

Yes, it actually does say EDIT MULTIPLE in the English UI, as well…  Sorry 'bout that…