The dialog is accessed from the Explorer panel (View » Panels » Explorer) by right-clicking on an Item then selecting Upload when uploading items such as 3D models, binary files, BOM templates, etc.
Release Notes - enter any release notes required.
Name - enter a different name for this revision of the item, if required.
Item ID - displays the unique item ID. The ID itself is typically a code in accordance with established naming conventions. For example, D-810-XXXX may be used to reflect a fabricated Blank Board Item, while D-820-XXXX may reflect an Assembled Board Item. The Item ID cannot be changed after the Item is released.
Description - enter a meaningful description for this revision of the item.
Sources - drag and drop the required file(s) as supported by this item type into this region.
Add - click to access the Add Files dialog (a standard Windows open-type dialog). Use this to browse to, and open, the required file(s), as supported by this item type.