Step 1:  Mouse over the file that you wish to move to engage the 'More' menu. 



Step2:  Select the 'Move to Project' button that appears in the panel



Step 3:  Use the 'Projects' dropdown menu to toggle to the project where you would like to move the file.


 
Step 4: 
 Once a project has been selected, click the 'Move' button to move the file.