Hello Agokul,
We don’t debug ad tags. Please make sure you are passing the tag as an MRAID tag. If the tag is built correctly and is passed as MRAID, it will use the MRAID ad view. If not, it will use the default adview and expand in the 320x50 slot.
You can however, set up a sample app using our banner integration documentation after getting set up in “Getting Started”. However, it should work in the sample app regardless.
iOS
Getting Started
Integrating Banner Ads
Android
Getting Started
Integrating Banner Ads
You can work with one of our Rich Media Vendors to see how they implement their expandable banners here.