Projgeekette

Hi, I would like to know how to change the "snippet" image when the following occurs: I created a note with an attached pdf. I observed that I uploaded the wrong pdf. I deleted that pdf in the note. I then had an empty note. The original snippet remained in the middle column. I then uploaded the corrrect pdf to the same note. Result: The "snippet" (thumbnail) in the middle column is still the image of the wrong pdf. ...Is there any way to change the snippet, or do I need to delete the note and create a new one with the correct pdf attached? Thanks -