My last course I was able to use my canvas app on my smart phone, then at the end of that course no longer could I do my learning or assignments or even my quizzes. Now I have two new courses and I cant do anything  for them on my canvas app. It pulls up a page that says expired or that it's not supported.  I'm getting way behind in my courses because I'm not able to use the canvas app on my smartphone. I'm not always able to just sit down on the laptop and do my work. That's why I would like to know how I can fix it or what maybe going on. Thank you..