Hi Peyton, thank you for your interest. Playism is handling the localization of the game in Simplified Chinese, which will be available when the full game is released on July 27.
You are free to create videos using footage from the game's beta, or from the full game after its release. A number of players have already shared beta gameplay on other streaming and video sites, and using a site like Bilibili to share gameplay or other Idol Manager-related content would be fine.