Attachment Details:

    * The *Size* tells you how much space the attachment takes up. You can sort by size by clicking the column title.
    * The *Creator* is the user who attached this file. The person who uploaded each new version of a file will be acknowledged as the creator of that version in this column. Clicking on the link takes you to their profile.
    * The *Last modifier* is the user who last modified the file. Actions that qualify as a modification include renaming, moving, add/update comment or update content type. 
    * The *Creation Date* is the date the file was attached. You can sort by date by clicking the column title.
    * The *Last Mod Date* is the date the file was last modified. Please refer to definition of _Last Modifier_ for a list of actions that qualify as a modification. 
    * The *Comment* is a short description for the attachment.
    * The *Edit* link lets you edit the attachment details.
    * The *Remove* link lets you delete the attachment.

In the screenshot above, _A. D. Ministrator_  created the first version of {{harbour.jpg}}, _John Smith_ uploaded the second version and _Jane Smith_ added a comment (and is listed as the last modifier).