If you would like to enable username lookup on the internal share (Enterprise licenses only), you can do it like:

First, you need to make a form called "share_form" in your prefs, WebInterface, custom forms. It needs to have one element: "shareUsernames". This form and text field element are just placeholders to enable this form to function with the lookup system.

Now that you have the form, you need a text file that will be referenced, so make a folder called "forms" in your CrushFTP main folder.

As these are done, go to the Admin, Jobs and create a new job, and configure it like:

Now all you have to do is, set true the Enable Username lookup while sharing files internally.