Image / HTML5
File size: max 100 kb
Format: jpg, gif, png, html5 or 3rd party script
Html5 guidelines: https://support.google.com/admanager/answer/7046799?hl=en
Video
Video format (.mp4, h264, no audio)
File size: max 1 mb
Wallpaper
File size: max 400 kb
Format: jpg, png
