Hi Kaesha,
the Mobile app doesn't support all Moodle activities, some of them are really hard to implement (like quiz). We keep implementing them bit by bit. Please take into account that the Mobile app was released 2 years ago while Moodle has more than 10 years and more manpower.
The Mobile app right now supports the following Resources:
- Book
- File
- Folder
- IMS CP
- Label
- Page
- URL
About activities, it supports these ones:
- Assignment (view them, not submitting).
- Forum (again, view forum, you can't send messages yet).
- Chat
- Choice
Also, the modules supported depend on the Moodle version. If you have a Moodle 2.7 some of the modules listed above won't be available in your app using that site. If you want your site to support all those activities without updating to the latest version (2.9.1) you can install the Moodle Mobile Additional Features plugin.
Please let us know if you have any more doubt.
Dani