Final answer:
The Swing Era bassist known for advanced harmony in bass lines, syncopation with melodic figures, versatility, and being a jazz photographer, loved by colleagues, is Milt Hinton.
Step-by-step explanation:
The Swing Era bassist described as having advanced harmonies in his bass lines, syncing those with melodic figures, showcasing versatility, and being an important jazz photographer, while also being much loved by his colleagues is Milt Hinton. Milt was known for his musical prowess which pushed the boundaries of traditional bass playing in jazz. Additionally, his passion for photography produced a significant body of work documenting the jazz scene, making him a unique figure in the history of jazz music both as a musician and as a chronicler. Milt Hinton was an exceptional talent who left an indelible mark on the jazz world not just with his playing but also with his lens.