When the primary HTML5 assets get delayed, what will serve in a user’s browser as it’s loading?
- Default ad
- .swf file
- Polite load image
- Backup image
Upload a polite load image so that you have something to show if there are delays loading your primary HTML5 asset to a browser. When your creative is delivered, the polite load asset loads first before each impression, followed by your primary HTML5 asset. This way, if the user’s browser experiences a delay loading your primary asset, the polite load image will be there until everything else finishes loading.
Read more here: https://support.google.com/dcm/answer/4558694