Documents that are in a static folder can be moved to another folder by using the Move to Folder right-click option.
To move documents to a folder:
The document is removed from the previous folder and placed into
the selected folder. To have a document shared between multiple folders, see Copying Documents to Another Folder.
Note:
You may not be able to manually add documents to all folders. For potential conditions preventing you from adding documents to a folder, see If You Cannot Add a Document to a Folder