Short answers, pulled from the story.
The first surviving manuscripts appeared much later among the Gandhāran Buddhist texts found in modern Pakistan. These fragile palm-leaf pages date from the first century BCE to the third century CE.
Scholars note that these documents were written in Gāndhārī, an Indo-Aryan language distinct from Pali or Sanskrit. Monks began composing manuscripts in various languages including Pali, Gāndhārī, and Buddhist Hybrid Sanskrit.
Buddhist traditions divided their scriptures into three main canons rather than one unified collection. The Theravāda school preserves the Pāli Canon known as the Tripiñaka or Three Baskets while East Asian Buddhism relies on the Chinese Buddhist Canon which includes the Taishō Tripiñaka edition.
Texts like the Lotus Sutra claimed that Buddhas live eternally helping others through transcendent activity. The Diamond Sutra and Heart Sutra represent popular examples of Prajñāpāramitā literature.
Gölo Zhönnupel completed the Blue Annals in 1476 CE offering a historical survey of Tibetan Buddhism. These works combined esoteric instruction with biographical narratives to guide practitioners toward swift Buddhahood.