The feature, in its present form, permits a channel administrator to edit the content of a previously posted message including the substitution of attached files such as PDFs while the original send-time stamp is retained. This capability has been used, in respect of multiple recent examinations, to fabricate after-the-event "paper leak" artefacts: a channel administrator edits an older, innocuous message to insert the actual question paper after the examination has been conducted, and the resulting chat is then circulated as purported "evidence" that the paper was in circulation before the examination.