Currently, this feature is available in the beta version of Telegram for Android, and allows users to publish media content on devices that support the Google Cast protocol previously known as Chromecast. The new function allows you to publish media files directly on a wide screen from channels, as well as videos and photos from chats.
Reproduction management can also be done directly from telegram application. However, this function is still unknown when it appears in the stable version of Messenger in Android or iPhone. Currently, the broadcasting function only works from the media file imaging tool.
Source: Ferra

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