Sub projects not shown
To maintain a good overview, I use top level projects (like folders), with sub projects (folders) underneath. When using the web version of todoist, when i click on a top level project, it lists all of the tasks below that top level project, sorted in sub projects. On the mobile android app the list shows empty, when i choose a top level project, which defeats the purpose of having a hierachy of projects / folders. Why is that?
Which android device are you using, which version of the OS? On the Android version, there will be an arrow on the right side of the Project, which will expand any sub-projects. Are you saying when you do this nothing shows up?
Please try clearing the data for the app (Android Settings, Applications).