Update your Android App so that users can see folders. My students don't have computers and use their phones.
Currently Android users can't see any folders in the Teams app so all documents, class materials have to added to the general channel and not grouped in files.
I’m very happy to announce that the Class Materials folder is now available on iOS and Android devices! Go to the Microsoft Teams app to now see the Class Materials folder.
Sudhir Dua commented
Please disable the Call Quality question after every call. Bad user experience.