Hello, If its a managed device and you can install apps silently on it clicking the update button will tell the device to go update this app. If it is a non managed device the user would get prompted to update the app. If the app fails to update for any reason whether the device doesn't have connection to SM, the user declined the prompt, etc if it fails for any reason the update button will remain there. You can get more information around the update status on the device details page under the activity section. https://documentation.meraki.com/SM/Apps_and_Software/Updating_Managed_iOS_Apps
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