ReadonlyopenTaps the next arrow and opens the share sheet with the caption typed in the editor
(options). Answers its handle.
ReadonlyopenTaps the sticker button and opens the sticker tray. Answers its handle.
ReadonlyshareTaps Your story: shares the photo at once. The caption is checked, the photo is uploaded, the creation screens close and the story is configured; the action waits until the server has made it. Answers the story the server created.
The actions of PostingStoryPhotoEditorScreen: the methods you call on its handle while the screen is open.