Within Nucleus, it is possible to move items as you wish. To do this, follow the below steps.
Locate the file you would like to move. In this example we'll be moving Site Details.txt to the Study 2 folder
Selecting the file will display the context menu
Click the More Options button, then click the Move button
Using the menus, navigate to the location where you would like to move the file to and click the Move to folder button. You will now see the file in the specified location.