Final answer:
Walter Benjamin warns that photography cannot expose the truth or capture moments in their entirety, but it can enhance reality and beautify suffering.
Step-by-step explanation:
Walter Benjamin's warning about photography is that it has the ability to enhance reality and beautify suffering, but it cannot expose the truth or capture moments in their entirety. In his essay, Benjamin argues that photographs and films strip their original objects of their authenticity by removing them from their original contexts. While photography can alter and enhance our perception of the world, it cannot provide a complete representation of reality or reveal the whole truth.