In each case, you will eventually see an "annotation" window popup. This allows you to add any message to the log file of the given item. For example, you might annotate the a_note.txt file as follows:
NOTE: If the item does not exist in the Repository, the annotation window title will be red. Otherwise it will be blue (as above). This should let you know whether you've dragged the item onto it's correct (existing) module. Press the Ok button to accept the annotation.
If everything goes well, you will then be able to examine the log files for any of the items you checked out. Click here to see how.