Action Details
Requirements and how-to articles for Google Ads's action:

paid action
These ads offer advertisers twice the height of the standard 'mobile leaderboard'. Suitable for mobile text and display ads.

You need this to get it done:

Large Mobile Banner
You can create a responsive display ad, or upload a display ad. You can also choose to copy existing ads.
You can upload image ads as .gif, .jpg and .png
You can upload AMPHTML ads as a .zip containing 1 HTML document and up to 39 media assets.
Maximum file size: 150KB
Dimensions: 320 x 100 pixels
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

Google AdSense Help - Guide to Ad Sizes
List of different ad sizes and how well each one performs.
Link missing here or found errors? Improve How-Tos