According to the Buddhist scriptures, when the Buddhist scriptures were collected for the first time, Ananda recited the scriptures, which was to repeat what the Buddha said. As for who was in charge of recording, it was impossible to verify whether it was recorded on Bayeux leaves at that time. It is said that the first collection did not form a written record, but was memorized by 500 arhats, whose memory is amazing. The formation of shellfish leaves may be later.
But what is certain is that Ananda didn't write a record, because Ananda was responsible for retelling the Buddha's lecture, so it was impossible to record it.