Drag and drop method
To move a file or folder into another folder, simply click and drag the file/folder and drop it into the folder where you want to be located.
To move a file out of a folder, drag and drop it onto the folder name in the breadcrumb trail where you want it to be located. You can move files into any folder in the path.
Using the 'Move to...' menu option
You can also move files and folders around in the documents section by clicking on the three-dot menu to the right-hand side of the file/folder and clicking Move to...
You can then click through all the folders in the documents section to find the new location, and click on the Move Here button to move the file/folder to that location.