Please see the link Inventory Fields here for more information on the terminology in the advertising industry.
Attaching the artwork of the campaign is very important on Ads2Trade. It shows the final artwork has been approved, and all appropriate changes have been made. It gives physical evidence to both the Media Buyer and the Media owner as to what will be displayed on the asset spaces purchased. It helps to see if the artwork meets the asset spaces requirements to prevent any issues upon flighting.
In the same upload pop up section where the artwork is uploaded, Ads2Trade offers an upload section for proof of flighting as well. This helps to show proof that the campaign is on its asset space for public view, as well as seeing if the riggers have done their job correctly.