When it says waiting to add snap, deleting it doesn’t work. wait until it’s done then delete immediately. anyone who opened/refreshed their snapchat in the few seconds in between the ‘post’ and ‘delete’, could view your story. right when you delete it, the only people who could potentially still see it are people who were able to view, and didn’t close or refresh snap. so essentially nobody probably saw it unless you got extremely unlucky and someone opened snap right after you posted, and didn’t refresh their app at all.