Subtasks, assignees and task resources

Real work usually has more than one person on it, so a task and a subtask both hold a list of assignees rather than a single owner.

1. Open a task from the board. The right hand panel shows Task Status, Task Priority, Due Date, Task Privacy and Task Assigned To.
2. To break the work down, click Add Subtask. The dialog is the same three steps as a task: title and description, then priority, status, assignees, due date and privacy, then a review and Create Subtask. New subtasks appear under Sub tasks in the panel, and a closed one is struck through.
3. Click a subtask title to open it on its own page, where it has the same actions a task has.
4. To add people, click Actions, then Assign to Me to take it yourself, or Assign to Someone to pick from the list. On a task or subtask the picker is multi select, so you can add several people at once. If someone is already assigned it asks you to confirm the reassignment first.
5. To remove someone, click the small cross on their chip under Task Assigned To and confirm. That control is hidden once the task is closed.
6. Add Resources under Actions attaches files to the task itself rather than to a comment. They appear under Resources in the panel.
7. Comment at the bottom of the page, with Attach Files for up to three files at a time. Your own comments carry a menu with Edit Comment and Delete Comment.

Issues, feature requests and change requests take one assignee rather than a list, so the same Assign to Me and Assign to Someone actions there replace whoever held it before.