When we upload a new build of the SPINSIGHT App to TestFlight, it is valid for 90 days. This is the default limit set by Apple. After that TestFlight will count down and may show a warning when it reaches 30 days. We will upload a new build before it expires.
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TestFlight will usually update apps automatically but on some devices you need to open TestFlight manually and click the update button. It may require a WiFi connection to the internet to download apps.