Hi @Kiki30,
Welcome to the Roku Community!
We are here to assist you with your concern about casting an Android phone to your Roku Express. We would be more than willing to provide you with further details.
Please be aware that for your Roku Express or any Roku device to operate effectively, it must be connected to the internet. This connection is essential not only for streaming content but also if you wish to cast media from your phone to your TV. To enable casting, make sure that your Roku device is online and connected to your home Wi-Fi network before attempting to synchronize it with your phone.
For more details, please visit our Roku support article: How to screen mirror from your phone, tablet, or computer to your Roku streaming device | How to cast apps like YouTube or Netflix from your phone to a TV
We hope you find this information helpful.
Regards,
Riamie
Riamie D.
Roku Community Moderator
