If you cannot see any content in a project, it is likely that the project is set to 'Private.' You will need to reach out to the owner and ask them to add you as an Editor or Guest.
If the project is set to 'Public', you should be able to view it.
If you are an admin/editor of the the project and can't see anything try the following:
- Check if you have a stable network connection
- Force quit the app and re-open it
- Clear the cache using this guide.
- Leave the project and then rejoin.