Milera was playing SANFL football for Central District at 17 and was taken by the club he grew up supporting at pick 11 in the 2015 national draft. He won a Rising Star nomination and the Mark Bickley Emerging Talent Award in 2017, then moved to half-back. Injuries have interrupted him repeatedly, from a foot stress fracture in 2020 to a ruptured patella tendon in Round 3, 2024. He has played 142 games and kicked 33 goals.