WARNING: This page is about a different car, the 2024 Audi S6 and 2024 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pressing On Inner Joint
Courtesy of AUDI OF AMERICA, LLC
-- Press CV joint on to stop.
-- Install circlip.
WARNING:
Chamfer on inner diameter of ball hub (splines) must point toward collar on shaft.