Question speaker and camera android phone

I’ve downloaded the official ChatGPT app on my Xiaomi Poco X5 phone and when I use the voice call feature it answers through the earphone speaker rather than the normal (?) speaker. Also, is there a way I can enable the camera like in thevideo from the official openai site titled “Happy Birthday” and the video titled “Interview Prep” ? On my phone there is no camera button. (yet…?)