It's actually possible to paste in a folder using the standard file manager. Once you've selected the files you want to copy and you've pressed the screen for long enough, you have the option to cut/copy (which you probably know by now).
Go to the location where you want to paste your files, and touch the bottom right (Menu) button > Edit > Paste.
Go to the location where you want to paste your files, and touch the bottom right (Menu) button > Edit > Paste.