Involved in the import of UDP-glucuronic acid (UDP-GlcA), UDP-N-acetylgalactosamine (UDP-GalNAc) and UDP-galactose (UDP-Gal) from the cytoplasm into the Golgi lumen for the biosynthesis of glycoconjugates that play a pivotal role in development (PubMed:11259660). Involved in the synthesis of chondroitin sulfate and heparan sulfate proteoglycans (PubMed:11005858). Required for embryonic development (PubMed:9927677). Involved in vulva epithelium invagination and embryonic development (PubMed:9927677, PubMed:11259660). Involved in the directed migration of hermaphrodite-specific neurons (PubMed:24052309). Belongs to the TPT transporter family. SLC35D subfamily.