1, The app does not support create and edit cards now, and we did not plan to support this feature in the recent. The only way to edit cards is on this website. You can edit cards, upload images for cards and use more format on the site.
There is a big button for edit cards.
2, landscape, it's on our todo list, and we will support this soon.
3, Yes, we try it, and we use it a lot.
You could tell us what you want and we will see how to add more features to the app and make it better and better.
, over 1 year