In the Catholic church are there still information orally handed down within the order and Pope that is from tradition/teachings and not from any documents/writings?
Such as oral teachings of Jesus or the apostles that the common person normally would not have access too?
Or is everything recorded in manuscripts but not accessed to people outside of the order?
There is nothing that people do not have access to. There are no secrets.
However, there are some theological concepts, seldom used rituals, historical documents, historical facts, etc which the average lay person (and even some priests and bishops) do not know.
Not because they are secret, but because they haven’t been trained in them or studied them.
For example, most Catholics do not have graduate degrees in Catholic Theology, Catholic History, Pastoral Services, Divinity, Biblical Studies, Canon Law, etc. Also, why most priests have 1 or 2 Masters degrees in religion, their degrees are usually in Divinity and Pastoral Services. Many do not not have a theology degree. Or if they do have a theology degree, they might not have a degree in canon law.
Bishops typically have a doctorate degree in theology or canon law, but a doctorate in theology doesn’t necessarily mean that they know everything there is to know about theology. Just like a doctorate in medicine doesn’t mean that a doctor knows everything there is to know about medicine.
However, again, with all this said: nothing is secret and a lay person can learn more about whatever they want to learn about.
I pray this is helpful.