Let's see if there is anything wrong with the settings. If you are not allowed to access the microphone and your position in the national settings, you will not be able to sing normally.
Either the video you uploaded is too long and then you don't support it, because generally speaking, if you upload a video of national karaoke, if it is broken, it must be that your mobile phone signal is not good and then it will be interrupted, or the video sent by your mobile phone is too long.