No features on Zoom, only video chat

Please someone help me. Zoom used to work so well for me on my tablet. Now I cannot share screen, annotate, nothing accept for video chat. What has happened? Ive uninstalled the app and reinstalled it but makes no difference.  Has this happened to anyone else? I pay through monthly fee and I teach online, please help I'm totally stressed and cannot work.  I'm on a Samsung A9 tablet.