Thankfully, for those hoping to give Roku screen mirroring a try, the process is pretty simple. As with any technical process ...
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How to cast to your Roku
Selecting that and then selecting the Roku device lets you mirror after you type in the code that will show up on your TV. For Android phones, you need to go into Settings and select Share & Connect.
Then make sure that VLC is installed on the device you plan to mirror – you can install VLC on your Android device or VLC on Windows. How to get VLC on Roku by mirroring from Windows 1.