How an app asset works
You choose the platform, select the app, and Google adds a separate link beneath the text ad on mobile. Tapping the headline still goes to the website; tapping the app link goes to the store listing. Both are charged as clicks, so the asset does not give you a free second route — it gives the searcher a choice, and you pay whichever one they take.
It is not the same thing as an app campaign. An app campaign is built around installs and takes over most of the targeting and creative decisions; the asset is a small addition to an ordinary Search campaign that still exists to sell whatever the website sells. Choosing between them is really a question of what the campaign is for.
Why app assets matter
For some businesses the app is the product experience and the website is only a brochure. Remittance, banking, delivery and booking services fall into that group: the customer’s real relationship happens inside the app, and every extra step between the search and the install loses people. The asset removes one of those steps.
It also protects a search you would otherwise half-answer. Someone typing your brand name plus the word app has told you exactly what they want. Sending them to a homepage where they hunt for a download link is a worse outcome than a link that goes straight to the listing.
Where app assets go wrong
The usual mistake is adding it because it is available rather than because installs matter. If your goal is a phone call or a form, the app link competes with the thing you actually want and you pay for the distraction. Where installs are genuinely the objective, an app campaign is built for the job and the asset is a poor substitute.
The second is buying traffic to a listing that cannot sell. The click ends on a store page with its own screenshots, description and ratings, and if that page is weak the money is spent before the persuading starts. The third is measurement: without install and in-app conversion tracking in place, nobody can say whether the asset did anything at all.
What to do about it
Decide the campaign’s single job first, then add the asset only if an install genuinely serves it. Before turning it on, treat the store listing as a landing page and fix it — the title, the first screenshots and the opening lines of the description do most of the work, which is the domain of app store optimisation.
Set up install and in-app event measurement so the asset can be judged rather than assumed. And think about the connection the install happens on: a large build downloading over mobile data on a slow connection loses people between the tap and the first open, which matters a great deal for audiences in Nepal and similar markets. A smaller build, or a lighter first launch, protects everything the ad bought.