Here you can upload or provide URL for the video ads which you can set it to be pre-roll or post-roll while
Also you can provide the target URL if you want the user to be redirected to a particular site when the ad is clicked.
Click URL and Impression URL
You are needed to code on your own if you want to track the number of clicks and impression for the particular video. We have just given the provision where you can mention the path to the coded file.