Balta scripta
Identified as Balta scripta on Bowerbird by Graeme Cocks
Little red spider no more than a cm wide. Dorsal red with black. Ventral red with yellow spots. Sorry about the focus - its web kept blowing in the wind.
Prey observation - https://www.inaturalist.org/observations/208863407
Predator observation - https://www.inaturalist.org/observations/208863406