Involved in vesicular trafficking at the Golgi apparatus level. Involved in endosome-to-Golgi trafficking. Mechanistically, captures transport vesicles arriving from endosomes via the protein TBC1D23 (PubMed:29084197, PubMed:38552021). Recognized vesicles are then tethered to the trans-Golgi before subsequent SNARE engagement and vesicle fusion. Selectively regulates E-cadherin transport from the trans-Golgi network in tubulovesicular carriers (PubMed:34969853). {ECO:0000269|PubMed:29084197, ECO:0000269|PubMed:34969853, ECO:0000269|PubMed:38552021}. (Microbial infection) Plays an important role in poxvirus morphogenesis. Translocates into the viral factories where it may transport the membrane fragments and associated protein factors important for virus maturation to the sites of virion assembly. . This is the function of GOLGA1 (golgin A1, Ensembl gene identifier ENSG00000136935).