Spin filament alignment refers to the observed tendency for galaxies to have their rotational axes (spin vectors) aligned with or perpendicular to the cosmic filaments in which they reside. Surveys have revealed statistically significant correlations between galaxy angular momentum directions and the orientation of nearby large-scale filamentary structures, with the alignment signal depending on galaxy mass, morphology, and position within the filament. In Lambda-CDM, galaxy spin is thought to arise from tidal torque theory, where dark matter halos acquire angular momentum through gravitational interactions with the surrounding matter distribution during the early universe. However, simulations struggle to reproduce the observed strength and mass-dependence of spin-filament alignments, with some studies finding alignments that are too weak and others finding the wrong mass trends compared to observations. The tension suggests that either the tidal torque mechanism is incomplete, dark matter halo properties differ from predictions, or additional physical processes shape galaxy angular momentum in ways not captured by standard structure formation models (Tempel et al. 2013; Codis et al. 2018).