You can move content from any folder to any other folder. Or, you can copy content from one folder to another. At the end of both procedures, a copy of the content resides in the new folder. Moved content retains the original ID number, while new content gets the next available ID number.
When copying, you leave the content in its original folder, while moving deletes the content from the original folder. Other than that difference, the procedure for performing both actions is virtually identical.
