You can use Groovy scripts to copy files in your file system.
Where To Use
You can use this script anywhere in ReadyAPI.
Example
Groovy
//Import libraries for working with files
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.Files;
//Create objects for the copied file and the target file
Path source = Paths.get("C:\\Users\\elle.stevenson\\Desktop\\test.xlsx");
Path target = Paths.get("C:\\Users\\elle.stevenson\\Desktop\\out\\copied.xlsx");
//Copy the file
Files.copy(source, target)