The Chromecast option is available on the iOS app where:
- You are on the same network as your Chromecast device,
- You are using iOS10 or later,
- You have given permission for the STV app to access that network.
If you are using iOS14 or later, you will need to give permission to individual apps to access your local network to connect to other devices - such as Chromecast. It's only required the first time after you update your device.
You will get a pop up asking you to allow access to the network when you first try to cast - click OK to allow access, and you can cast as normal.
If you don't give permission you will not be able to use Chromecast and the option will not be shown in your app.
You can change this setting at any time by going to Settings -> STV Player -> Local Network and toggling this to on/off - then Close and Restart to apply the new settings.