Flutter messaging App

I have been working on a messaging app using Flutter for almost a year now and I'm getting down to the finer details to wrap this up. I need some help with a few final features that I'm having troubles implementing and need someone with flutter experience to help me finish it. Edit: Things left to do: *-add notification/msg read functionality when user gets new message, eg. little circle with number of unread msgs inside *-push notifications is setup but it doesnt open to the users message screen *-a better architecture on the firebase storage side of things for holding the media, eg if a user removes themselves from a chat, *-mobile ads to randomly show in the video bubble after certain amount of messages sent. show in center of screen to both users *-currently video messages show a thumbnail and user clicks on it to open a playback screen, I'd like the video bubble to play the clip without sound, all clips are set to 10 seconds, I know VLC has a flutter plugin that allows multiple videos at a time to play on same screen, but I couldnt get it to work. *-the audio clip waveform doesnt load until the user leaves and re-enters the chat screen, *- tabbed navigation from profile page to contacts/requests screens programmatically *- internet connectivity showing when user has internet to be able to send messages like FB messenger