The suspected gunmen in the Bondi Beach attack threw explosives at the start of the deadly incident and had practised shooting weeks before, according to new court documents.
They allege the pair meticulously planned the attack for months and, two days prior to the shooting, visited Bondi for reconnaissance.
Fifteen people were killed and dozens more injured when two gunmen opened fire on a Hanukkah celebration on 14 December. Explosives, including a tennis ball bomb, failed to detonate, the documents said.
Naveed Akram, 24, has been charged with 59 offences, including 15 counts of murder and one of terror. A second gunman - his father, Sajid Akram - was shot dead by police at the scene.
Included in the new court documents are the details of several videos tracing the movements of the alleged gunmen in the months, days and hours before the attack.
One video - taken on one of their mobile phones in October - is described as showing the men sitting in front of an image of an Islamic State group (IS) flag.
They are heard making statements about their motivations for the attack and condemn the acts of 'Zionists', police say.
Police said separate footage from October shows the father and son conducting firearms training in a countryside location, believed to be in New South Wales. They are seen firing shotguns and moving in a tactical manner, officials added.
At around 02:00 (15:00 GMT) on the day of the attack, two men were captured on CCTV leaving rented accommodation in the Sydney suburb of Campsie carrying long and bulky items wrapped in blankets, which they placed into a car.
The documents note these include two single barrel shotguns, a Beretta rifle, four improvised explosive devices (IEDs) and two IS flags.
Police say shortly after 17:00 (08:00 GMT), the men were seen leaving the rental. Separate footage captures them arriving at Bondi at 18:50 (09:50 GMT), where they parked and placed the flags on the inside of the front and rear windows.
It was from this location that police believe they threw the explosives - three pipe bombs and a tennis ball bomb - towards the crowd, though none exploded.
The attack has sparked calls for tougher restrictions on gun ownership. On Monday, New South Wales state recalled its parliament to debate a raft of new gun and protest laws, proposed in the wake of the shooting.
There is also growing pressure for Albanese to call a Royal Commission, Australia's highest level of public inquiry, into the Bondi terror attack, with calls coming from the Jewish community and MPs.
