The First Large Absorption Survey in HI (FLASH) is one of the ongoing large survey science programs with the Australian SKA Pathfinder (ASKAP), designed to uncover a substantial new sample of neutral hydrogen (HI) absorption systems at intermediate redshifts (0.4 < z < 1.0) across ~24,000 square degrees of the sky. The survey aims to advance our understanding of the cosmic HI content of the Universe by identifying both intervening and associated absorption systems. Intervening HI absorbers trace the distribution of cold gas along the line of sight toward background continuum sources, while associated absorbers probe circumnuclear and host-galaxy gas directly linked to AGN activity. Following successful Pilot observations beginning in 2019, the Full Survey is now nearing completion, with over 90% of its planned footprint observed. I present the current survey status along with initial published results. I also give a brief overview of ongoing multi-wavelength follow-up programs, particularly those using facilities to which KASI has strong access, including ALMA, Gemini, and KVN. A subset of the identified absorbers spans a wide range of line widths, column densities, and kinematic structures. By comparing their absorption properties with host galaxy characteristics, we investigate how these systems trace gas reservoirs associated with AGN activity. These results extend our census of HI absorbers to higher redshifts and establish a crucial groundwork for future wide-field HI surveys with the SKA. *** This talk welcomes students and early-career researchers interested in SKA precursor survey data and its progress.