Answer:
when you need to move a file from the document folder to the new folder you just created can be done by different methods.
when you click right button of mouse there is a list pop up in which many options flashes you should choose either cut or copy from the list.
1)Choose 'cut' then paste it in the new folder. If you choose cut the file it will be removed from the document folder.
2)Choose 'copy' then paste it in the new folder. If you choose copy the file the file will remain in the document folder and also in the new folder