When you share a link to an app, it will open in a browser window on the user's mobile device. This article walks through how to download the app to the device so it shows on the user's app screen.
Android Instructions
Open the app link in the browser window on your mobile device
Click the three-dot menu in the top right corner
Select Install app in the drop-down
Click Install on the confirmation pop-up
The app will download to your device
iOS Instructions
Open the app link in Safari on your mobile device
Select the Add icon (square with up arrow) at the bottom
Click Add to Home Screen
Select Add in the top right corner
The app will download to your device