Load the essay from fileProxy.

Security: the current fileProxy /save endpoint has no authentication. Expose it only temporarily or behind access control, and stop or block it when editing is finished.

Each box edits one heading, paragraph, list item, or sequence line. Text wraps to the screen. Inline tags such as <em> and <strong> may appear in a box; keep them when they carry formatting you want. Save checks that the server copy has not changed since it was loaded.