About add feature to my exist app -- 2

I already have an app and I want to add some feature like voice note, so user can attach voice note and do record in post, and when user see the post with voice note, they can direct to play the voice note. you can check my app in playstore name is "anon id" or you can go to this link: [login to view URL] please check my app first and know how it works, my backend app is using php as api, mysql as database, and some php for output data in apl