Are the videos suppose to stay on the device?

I noticed that at least some of the Unity Ads that I tested with my game stayed on the device. Are they supposed to stay on the users device storage or am I doing something wrong? Some users might not be happy about the video ads taking space after they have closed the game.

 

Unity Ads keeps the next video in the ad request queue on the device. The way in which it does this is meant to save both space and bandwidth (videos are ~1.5MB each).

For instance, say you have more than one game on your device that has Unity Ads implemented. Rather than cache the same video file for each game, creating multiple copies, each game can share the same cached video file.

As a result, you save on both bandwidth and storage space. Having already cached the video also means it'll be ready the next time the video is shown.