The app can show the blocks that are supported, showing the unsupported block for the rest. We support the paragraph, code, and more blocks, and you can edit the text but not change the style. You can rearrange blocks using up/down buttons. We’ll look into loading and saving the editor contents. We expect this to be easy and ship it in this milestone, we want to learn about it early even if if it’s not, but it might be postponed to a future milestone.