If you are referring to the "Backup ad" input in ads, they are for ad block detection only if the current ads get blocked.I see you have an HTML input box for a backup
There is a package feature called "Enable placeholder" with an extra option that allows you to edit the placeholder ad and use your own code.Another scenario is an ad that says "advertise here" i.e. another ad I created, can be picked.
I didn't see any updates / replies to this post.Are there plans to support more granular than just Country level Geo Criteria?
You can't target based on city/state.